継続は力にゃりん。毎日続けることができるのか？

進捗

* 2006-11-03 終了
* 2006-10-23 基本構文
* 2006-10-10 Object
* 2006-09-21 RegExp
* 2006-09-10 Function
* 2006-09-01 Date
* 2006-08-20 Math
* 2006-08-03 Array
* 2006-08-02 Boolean
* 2006-07-11 String
* 2006-07-02 Number
* 2006-06-22 ビルトイン関数
* 2006-06-19 数値・文字列・定数
* 2006-06-01 演算子

!2006-11-03 Fri

  js> with(x) {
    print(x.toString(2));
    print(x.toString(16));
  }
  1010
  a

なんで、x.with みたいなのじゃないのだろうか？

!2006-11-02 Thu

  js> for (i = 0; i < 3; i++) {
    if (i == 1) continue;
    print(i);
  }
  0
  2

!2006-11-01 Wed

  js> loop:;
  js> print("loop:");
  loop:
  js> for (i = 0; i < 3; i++) {
    if (i == 1) break loop;
  4: SyntaxError: label not found:
  4:   if (i == 1) break loop;
  4: ....................^

ラベル使えない？？？

!2006-10-31 Tue

  js> for (i = 0; i < 3; i++) {
    if (i == 1) break;
    print(i);
  }
  0

!2006-10-30 Mon

  js> for (x in [0, 1, 2]) print(x);
  0
  1
  2

!2006-10-29 Sun

  js> for (i = 0; i < 3; i++) print(i);
  0
  1
  2

!2006-10-28 Sat

  js> i = 0;
  0
  js> do {
    print(i);
    i++;
  } while (i < 3);
  0
  1
  2
  2

!2006-10-27 Fri

  js> i = 0;
  0
  js> while (i < 3) {
    print(i);
    i++;
  }
  0
  1
  2
  2

!2006-10-26 Thu

swiatch 文

  js> switch (1) {
  case 1:
    print("1");
  case 2:
    print("1 or 2");
    break;
  default:
    print("default");
  }
  1
  1 or 2

!2006-10-25 Wed

if 文

  js> if (true) print("true")
  true
  js> if (false) print("true") else print("false")
  2: SyntaxError: missing ; before statement:
  2: if (false) print("true") else print("false")
  2: .........................^
  js> if (false) print("true"); else print("false")
  false
  js> if (true) {
    print("true")
  } else {
    print("false")
  }
  true

!2006-10-24 Tue

行の継続、コメント
  js> x = 
  1;
  1
  js> // foo
  js> /* foo */

!2006-10-23 Mon

まず、標準出力って？

  js> document.write("Hello World!!");
  1: ReferenceError: document is not defined
  js> write("Hello World!!");
  2: ReferenceError: write is not defined
  js> print("Hello World!!");
  Hello World!!
  js> 

!2006-10-22 Sun

  js> function foo() {}
  js> ({ x : 1, y : 2}).watch("x", foo)

!2006-10-21 Sat

  js> (new Object).toSource()
  ({})
  js> (new Date).toSource()
  (new Date(1161313175469))
  js> { x : 1, y : 2}.toString()
  9: SyntaxError: invalid label:
  9: { x : 1, y : 2}.toString()
  9: ...........^
  js> ({ x : 1, y : 2}).toString()
  [object Object]
  js> ({ x : 1, y : 2}).toSource()
  ({x:1, y:2})

!2006-10-20 Fri

  js> (new Object).valueOf()
  [object Object]
  js> 1.valueOf()
  2: SyntaxError: missing ; before statement:
  2: 1.valueOf()
  2: ..^
  js> (1).valueOf()
  1
  js> (new Date(0)).valueOf()
  0
  js> (new Date(1)).valueOf()
  1
  js> (new Date).valueOf()
  1161313160300

!2006-10-19 Thu

  js> (new Date).toString()
  Thu Oct 19 2006 12:06:54 GMT+0900 (JST)
  js> /foo/.toString()
  /foo/
  js> (new Object).toString()
  [object Object]

!2006-10-18 Wed

  js> (new Object()).eval("1+2")
  3
  js> (new Object).eval("1+2")
  3
  js> eval("1+2")
  3

!2006-10-17 Tue

  js> "bar".foo
  js> String.prototype.foo = "foo"
  foo
  js> "bar".foo
  foo

!2006-10-16 Mon

  js> (new Object()).constructor
  
  function Object() {
      [native code]
  }

!2006-10-15 Sun

  js> new Object()
  [object Object]

!2006-10-14 Sat

継承
  js> function Point(x, y) {
        this.x = x;
        this.y = y;
        this.toString = function () {
          return ("(" + this.x + ", " + this.y + ")");
        }
      }
  js> function PointX() {
    this.z = this.arguments.pop();
    Point.apply(this, this.arguments);
  }
  js> new PointX(1,2)
  9: TypeError: this.arguments has no properties
  js> new PointX(1,2,3)
  9: TypeError: this.arguments has no properties
？

this をつけなくてもエラーなんだけど…
  js> function Point(x, y) {
          this.x = x;
          this.y = y;
          this.toString = function () {
            return ("(" + this.x + ", " + this.y + ")");
          }
        }
  js> function PointX() {
    this.z = arguments.pop();
    Point.apply(this, arguments);
  }
  js> new PointX(1,2)
  9: TypeError: arguments.pop is not a function

!2006-10-13 Fri

継承
  js> function Point(x, y) {
      this.x = x;
      this.y = y;
      this.toString = function () {
        return ("(" + this.x + ", " + this.y + ")");
      }
    }
  js> function Point3(x, y, z) {
    this.z = z;
    Point.call(this, x, y);
  }
  js> new Point(1,2)
  (1, 2)
  js> new Point3(1,2,3)
  (1, 2)
  js> function Point3(x, y, z) {
    this.z = z;
    Point.call(this, x, y);
    this.toString = function () {
       return ("(" + this.x + ", " + this.y + ", " + this.z + ")");
    }
  }
  js> new Point3(1,2,3)
  (1, 2, 3)

!2006-10-12 Thu

  js> x = { x : 1, y : 2}
  [object Object]
  js> x.x
  1
  js> x.y
  2
* メソッドの追加はできるの？
* 構造体っぽい使い方？

!2006-10-11 Wed

  js> function Point(x, y) {
    this.x = x;
    this.y = y;
    this.toString = function () {
      return ("(" + this.x + ", " + this.y + ")");
    }
  }
  js> new Point()
  (undefined, undefined)
  js> new Point(1, 2)
  (1, 2)

!2006-10-10 Tue

  js> function Foo () {
  }
  js> new Foo()
  [object Object]
  js> function Foo () {
    this.toString = function () { "Foo" }
  }
  js> new Foo()
  undefined
  js> function Foo () {
    this.toString = function () { return "Foo" }
  }
  js> new Foo()
  Foo

!2006-10-09 Mon

  js> "foo  bar  baz".split(" ")
  foo,,bar,,baz
  js> "foo  bar  baz".split(/\s+/)
  foo,bar,baz

!2006-10-08 Sun

  js> "foo 123 bar".match(/\d+/)
  123
  js> RegExp.lastMatch
  123
  js> RegExp.leftContext
  foo 
  js> RegExp.rightContext
   bar
  js> RegExp.lastParen
  
  js> "foo 123 bar".match(/(\d+)/)
  123,123
  js> RegExp.lastParen
  123

!2006-10-07 Sat

  js> re = /\d+/
  /\d+/
  js> "foo 123".match(re)
  123
  js> re.lastIndex
  0
  js> "foo 123 bar".match(re)
  123
  js> re.lastIndex
  0
？

!2006-10-06 Fri

  js> "foo 123".match(/\d+/)
  123
  js> RegExp.index
  js> RegExp.lastIndex
ない？

!2006-10-05 Thu

  js> RegExp.multiline
  false
  js> /^123/.exec("abc\n123")
  null
  js> RegExp.multiline = true
  true
  js> /^123/.exec("abc\n123")
  123

!2006-10-04 Wed

  js> $_ = "bar"
  bar
  js> /\S+/.exec()
  2: SyntaxError: no input for /\S+/
？

!2006-10-03 Tue

  js> RegExp.input = "foo"
  foo
  js> /\S+/.exec()
  foo
  js> RegExp.lastMatch
  foo

!2006-10-02 Mon

  js> re = /\S+/
  /\S+/
  js> re.exec("foo bar")
  foo
  js> re.exec("foo bar")
  foo
  js> re.exec("foo bar")
  foo
  js> re = /\S+/g
  /\S+/g
  js> re.exec("foo bar")
  foo
  js> re.exec("foo bar")
  bar
  js> re.exec("foo bar")
  null
  js> re.exec("foo bar")
  foo
  js> re.exec("foo bar")
  bar
ふーん

!2006-10-01 Sun

  js> re = new RegExp
  /(?:)/
  js> re.compile("\\S+")
  /\S+/
  js> re.test("foo bar")
  true
  js> re.exec("foo bar")
  foo
  js> re.compile("\\S+", "g")
  /\S+/g
  js> re.exec("foo bar")
  foo
  js> re = new RegExp()
  /(?:)/

!2006-09-30 Sat

  js> /\S+/.test("foo bar")
  true
  js> /\S+\s+\S+/.test("foo bar")
  true
  js> /\S+\s+\S+\s+/.test("foo bar")
  false

!2006-09-29 Fri

  js> /\S+/("foo bar")
  foo
  js> /\S+\s+\S+/("foo bar")
  foo bar
  js> /(\S+)/g("foo bar")
  foo,foo
  js> /\S+/.exec("foo bar")
  foo
  js> /\S+\s+\S+/.exec("foo bar")
  foo bar
  js> "foo bar".match(/\S+\s+\S+/)
  foo bar
  js> /\S+/.exec()
  foo
  js> RegExp.input
  foo bar

!2006-09-28 Thu

  js> "foo bar baz".match(/(\S+)/)
  foo,foo
  js> "foo bar baz".match(/(\S+)/g)
  foo,bar,baz
  js> x = "foo bar baz".match(/(\S+)/)
  foo,foo
  js> x[0]
  foo
  js> x[1]
  foo

!2006-09-27 Wed

  js> "foo bar foo".match(/(\S+)\s+(\S+)\s+\1/)
  foo bar foo,foo,bar
  js> "foo bar bar".match(/(\S+)\s+(\S+)\s+\1/)
  null
  js> "foo bar foo bar".match(/(\S+)\s+(\S+)\s+\1\s+\2/)
  foo bar foo bar,foo,bar

!2006-09-26 Tue

  js> "foo bar".match(/(\S+)\s+(\S+)/)
  foo bar,foo,bar
  js> RegExp.$1
  foo
  js> RegExp.$2
  bar
  js> RegExp.$&
  
戻ってこなくなった〜

  js> " foo bar 123".match(/(\S+)\s+(\S+)/)
  foo bar,foo,bar
  js> RegExp.lastMatch
  foo bar
  js> RegExp.leftContext
   
  js> RegExp.rightContext
   123
  js> RegExp.lastParen
  bar
  js> RegExp.input
   foo bar 123
  js> RegExp.multiline
  false

!2006-09-25 Mon

  js> new RegExp("foo").multiline
  false
  js> new RegExp("foo", "m").multiline
  true
  js> /foo/.multiline
  false
  js> /foo/m.multiline
  true

!2006-09-24 Sun

  js> new RegExp("foo").source
  foo
  js> /foo/.source
  foo
  js> /^foo$/.source
  ^foo$

!2006-09-23 Sat

  js> new RegExp("foo").global
  false
  js> new RegExp("foo", "g").global
  true
  js> /foo/.global
  false
  js> /foo/g.global
  true

!2006-09-22 Fri

  js> /foo/.ignoreCase
  false
  js> /foo/i.ignoreCase
  true
  js> (/foo/i).ignoreCase
  true
  js> new RegExp("foo").ignoreCase
  false
  js> new RegExp("foo", "i").ignoreCase
  true

!2006-09-21 Thu

  js> re = new RegExp("foo")
  /foo/
  js> "foo".match(re)
  foo
  js> "bar".match(re)
  null
  js> "foo bar".match(re)
  foo
  js> "FOO".match(re)
  null
  js> "FOO".match(/foo/i)
  FOO

!2006-09-20 Wed

  js> function foo() { }
  js> foo.apply()
  js> function foo(x, y) { return x + y; }
  js> foo.apply()
  NaN
  js> foo.apply(null, [1,2])
  3
  js> foo.apply(null, 1,2)
  7: TypeError: second argument to Function.prototype.apply must be an array

!2006-09-19 Tue

  js> foo = new Function("x", "x", "return x + y;")
  
  function anonymous(x, x) {
      return x + y;
  }
  
  js> foo(1,2)
  1: ReferenceError: y is not defined
  js> foo = new Function("x", "y", "return x + y;")
  
  function anonymous(x, y) {
      return x + y;
  }
  
  js> foo(1,2)
  3
  js> foo = new Function("x,y", "return x + y;")
  
  function anonymous(x, y) {
      return x + y;
  }
  
  js> foo(1,2)
  3

!2006-09-18 Mon

  js> function foo() { }
  js> foo(null)
  js> foo.call(null)
  js> function foo() { return 1; }
  js> foo.call(null)
  1
  js> foo.call()
  1
  js> function foo(x, y) { return x + y; }
  js> foo.call()
  NaN
  js> foo.call(1)
  NaN
  js> foo.call(1,2)
  NaN
  js> foo.call(null, 1,2)
  3
  js> foo.call(10,1,2)
  3

!2006-09-17 Sun

  js> function foo() { }
  js> foo.prototype
  [object Object]

!2006-09-16 Sat

  js> function foo(x, y) { return foo.caller; }
  js> foo()
  null
  js> function hoge() { foo(); }
  js> hoge()
  js> function hoge() { return foo(); }
  js> hoge()
  
  function hoge() {
      return foo();
  }
  

!2006-09-15 Fri

  js> function foo(x, y) { return foo.arguments; }
  js> foo(1,2)
  [object Object]
  js> foo(1,2,3)
  [object Object]
  js> function foo(x, y, z) { return foo.arguments; }
  js> foo(1,2,3)
  [object Object]
  js> x = foo(1,2,3)
  [object Object]
  js> x[0]
  1
  js> x[1]
  2
  js> x[2]
  3
  js> function foo(x, y, z) { return foo.arguments.length; }
  js> foo(1)
  1
  js> foo(1,2)
  2
  js> foo(1,2,3)
  3
  js> foo(1,2,3,4)
  4

!2006-09-14 Thu

ちょい寄り道

  js> function foo() { return foo; }
  js> foo()
  
  function foo() {
      return foo;
  }
  
  js> foo()()
  
  function foo() {
      return foo;
  }
  
  js> (foo())()
  
  function foo() {
      return foo;
  }
  
  js> f = foo()
  
  function foo() {
      return foo;
  }
  
  js> f
  
  function foo() {
      return foo;
  }
  
  js> f()
  
  function foo() {
      return foo;
  }
？

!2006-09-13 Wed

  js> function foo() {}
  js> foo.arity
  0
  js> function foo(x, y) {}
  js> foo.arity
  2

!2006-09-12 Tue

  js> foo0 = new Function("return 0;")
  
  function anonymous() {
      return 0;
  }
  
  js> foo0()
  0
  js> foo = new Function("x", "return x;")
  
  function anonymous(x) {
      return x;
  }
  
  js> foo(1)
  1
  js> foo()
  js> foo(1, 2)
  1
  js> foo = new Function("x", "x", "return x + x;")
  
  function anonymous(x, x) {
      return x + x;
  }
  
  js> foo(1)
  NaN
  js> foo(1,2)
  4
  js> function foo(x, x) { return x + x; }
  js> foo(1,2)
  4

!2006-09-11 Mon

  js> x = 10;
  10
  js> function foo() { x = 20;}
  js> foo()
  js> x
  20
  js> function foo() { var x = 30;}
  js> foo()
  js> x
  20
  js> function foo(x) { x = 30;}
  js> foo()
  js> x
  20

!2006-09-10 Sun

  js> function foo0() { return 0; }
  js> foo0()
  0
  js> function foo0() { 0 }
  js> foo0()
  js> function foo0() { 0; }
  js> foo0()
return は必要か〜
  js> function add(a, b) { return a + b; }
  js> add(1, 2)
  3

!2006-09-09 Sat

  js> new Date(0)
  Thu Jan 01 1970 09:00:00 GMT+0900 (JST)
  js> new Date(0)
  Thu Jan 01 1970 09:00:00 GMT+0900 (JST)
  js> Date(0)
  Fri Sep 08 2006 12:03:12 GMT+0900 (JST)
？

!2006-09-08 Fri

  js> Date.parse("Sep 1, 2006 12:00:00")
  1157079600000
  js> new Date("Sep 1, 2006 12:00:00").getTime()
  1157079600000

!2006-09-07 Thu

  js> Date.UTC(1970, 0, 1, 0, 0, 0)
  0
  js> Date.UTC(1970, 0, 1, 0, 0, 1)
  1000
  js> Date.UTC(1970, 0, 1, 0, 0, 0, 1)
  1

!2006-09-06 Wed

  js> new Date().getTime()
  1157511698571
setTime とばし

!2006-09-05 Tue

  js> d = new Date()
  Tue Sep 05 2006 12:00:13 GMT+0900 (JST)
  js> d.toString()
  Tue Sep 05 2006 12:00:13 GMT+0900 (JST)
  js> d.toLocaleString()
  Tue Sep  5 12:00:13 2006
  js> d.toGMTString()
  Tue, 05 Sep 2006 03:00:13 GMT
  js> d.toUTCString()
  Tue, 05 Sep 2006 03:00:13 GMT
  js> d.toVarDate()
  10: TypeError: d.toVarDate is not a function

!2006-09-04 Mon

  js> new Date().getTimezoneOffset()
  -540
60*9 か

!2006-09-03 Sun

  js> new Date().getUTCFullYear()
  2006
  js> new Date().getUTCYear()
  26: TypeError: (new Date()).getUTCYear is not a function
  js> new Date().getUTCMonth()
  8
  js> new Date().getUTCDate()
  1
  js> new Date().getUTCDay()
  5
  js> new Date().getUTCHours()
  3
  js> new Date().getUTCMinutes()
  8
  js> new Date().getUTCSeconds()
  6
  js> new Date().getUTCMilliseconds()
  499
set の方はとばし

!2006-09-02 Sat

  js> new Date().getFullYear()
  2006
  js> new Date().getYear()
  106
  js> new Date().getMonth()
  8
  js> new Date().getDate()
  1
  js> new Date().getDay()
  5
  js> new Date().getHours()
  12
  js> new Date().getMinutes()
  6
  js> new Date().getSeconds()
  3
  js> new Date().getMilliseconds()
  67
set の方はとばし

!2006-09-01 Fri

  js> new Date(2006, 9, 1);
  Sun Oct 01 2006 00:00:00 GMT+0900 (JST)
  js> new Date(2006);
  Thu Jan 01 1970 09:00:02 GMT+0900 (JST)
  js> new Date(2006, 9);
  Sun Oct 01 2006 00:00:00 GMT+0900 (JST)
  js> new Date(2006, 9, 1);
  Sun Oct 01 2006 00:00:00 GMT+0900 (JST)
  js> new Date(2006, 8, 1);
  Fri Sep 01 2006 00:00:00 GMT+0900 (JST)
  js> new Date();
  Fri Sep 01 2006 12:02:25 GMT+0900 (JST)
  js> new Date("Sep 1, 2006 12:00:00");
  Fri Sep 01 2006 12:00:00 GMT+0900 (JST)
  js> new Date("2006/9/1 12:00:00");
  Fri Sep 01 2006 12:00:00 GMT+0900 (JST)
  js> new Date("9/1/2006 12:00:00");
  Fri Sep 01 2006 12:00:00 GMT+0900 (JST)
  js> new Date("06/9/1 12:00:00");
  Sun Jun 09 1901 12:00:00 GMT+0900 (JST)
  js> new Date("99/9/1 12:00:00");
  Wed Sep 01 1999 12:00:00 GMT+0900 (JST)
  js> new Date("9/1/99 12:00:00");
  Wed Sep 01 1999 12:00:00 GMT+0900 (JST)
  js> new Date(2006, 8, 1, 12, 0, 0, 0);
  Fri Sep 01 2006 12:00:00 GMT+0900 (JST)
  js> new Date(2006, 8, 1, 12, 0, 0, 0, 0);
  Fri Sep 01 2006 12:00:00 GMT+0900 (JST)
  js> new Date(2006, 8, 1, 12, 0, 0, 0, 0, 0);
  Fri Sep 01 2006 12:00:00 GMT+0900 (JST)

!2006-08-31 Thu

  js> Math.pow(2, 3)
  8
  js> Math.sqrt(2)
  1.4142135623730951
  js> Math.exp(1)
  2.718281828459045
  js> Math.log(0)
  -Infinity
  js> Math.log(1)
  0
  js> Math.log(Math.E)
  1

!2006-08-30 Wed

  js> Math.max(1, 2)
  2
  js> Math.max(2, 1)
  2
  js> Math.min(1, 2)
  1
  js> Math.min(2, 1)
  1
  js> Math.max(2, 1, 0)
  2
  js> Math.max(1, 2, 3, 4, 5)
  5
  js> Math.max([1, 2, 3, 4, 5])
  NaN

!2006-08-29 Tue

  js> Math.PI
  3.141592653589793
  js> Math.SQRT2
  1.4142135623730951
  js> Math.SQRT1_2
  0.7071067811865476
  js> Math.E
  2.718281828459045
  js> Math.LN2
  0.6931471805599453
  js> Math.LN10
  2.302585092994046
  js> Math.LOG2E
  1.4426950408889634
  js> Math.LOG10E
  0.4342944819032518

!2006-08-28 Mon

  js> Math.asin(0)
  0
  js> Math.acos(1)
  0
  js> Math.atan(1)
  0.7853981633974483
  js> Math.atan2(0, 0)
  0

!2006-08-27 Sun

  js> Math.tan(Math.PI/4)
  0.9999999999999999

!2006-08-26 Sat

  js> Math.cos(0)
  1
  js> Math.cos(Math.PI/2)
  6.123031769111886e-17

!2006-08-25 Fri

  js> Math.sin(0)
  0
  js> Math.sin(Math.PI/4)
  0.7071067811865475
  js> Math.sin(Math.PI/2)
  1

!2006-08-24 Thu

  js> Math.abs(-1)
  1
  js> Math.abs(-1.2)
  1.2

!2006-08-23 Wed

  js> Math.round(-1.9)
  -2
  js> Math.round(-1.2)
  -1
  js> Math.round(-0.9)
  -1
  js> Math.round(-0.2)
  0
  js> Math.round(0.2)
  0
  js> Math.round(0.9)
  1
  js> Math.round(1.2)
  1
  js> Math.round(1.9)
  2
  js> Math.round(1.4)
  1
  js> Math.round(1.5)
  2

!2006-08-22 Tue

  js> Math.floor(-1.9)
  -2
  js> Math.floor(-1.2)
  -2
  js> Math.floor(-0.9)
  -1
  js> Math.floor(-0.2)
  -1
  js> Math.floor(0.2)
  0
  js> Math.floor(0.9)
  0
  js> Math.floor(1.2)
  1
  js> Math.floor(1.9)
  1

!2006-08-21 Mon

  js> Math.ceil(-1.9)
  -1
  js> Math.ceil(-1.2)
  -1
  js> Math.ceil(-0.9)
  0
  js> Math.ceil(-0.2)
  0
  js> Math.ceil(0.2)
  1
  js> Math.ceil(0.9)
  1
  js> Math.ceil(1.2)
  2

!2006-08-20 Sun

  js> Math
  [object Math]
  js> Math.random()
  0.21862627662526102
  js> Math.random()
  0.3746750266629789

!2006-08-19 Sat

  js> a = [1, 2, 3, 4, 5, 6]
  1,2,3,4,5,6
  js> a.length
  6
  js> a.length = 3
  3
  js> a
  1,2,3

!2006-08-18 Fri

  js> a = Array(1, 2, 3)
  1,2,3
  js> a
  1,2,3
  js> a = Array(1, , , , 3)
  3: SyntaxError: syntax error:
  3: a = Array(1, , , , 3)
  3: .............^
  js> a = [1, , , , 3]
  1,,,,3

!2006-08-17 Thu

  js> a = new Array()
  
  js> a["foo"] = 1
  1
  js> a["bar"] = 20
  20
  js> a["baz"] = 30
  30
  js> a
  
  js> a["foo"]
  1
  js> a["bar"]
  20
  js> a["baz"]
  30
  js> a.sort()
  
  js> a.push(10)
  1
  js> a.push(100)
  2
  js> a.push(1000)
  3
  js> a
  10,100,1000

なんか良く分からないなあ〜

!2006-08-16 Wed

  js> new Array(1, 2, 3, 4, 5, 6).reverse()
  6,5,4,3,2,1
  js> new Array(6, 5, 4, 3, 2, 1).reverse()
  1,2,3,4,5,6

!2006-08-15 Tue

  js> new Array(6, 5, 4, 3, 2, 1).sort()
  1,2,3,4,5,6
  js> a = new Array(6, 5, 4, 3, 2, 1)
  6,5,4,3,2,1
  js> a.sort()
  1,2,3,4,5,6
  js> a
  1,2,3,4,5,6
  js> function my_cmp(a, b) { if (a > b) {return -1} else if (a < b) {return 1} else {return 0} }
  js> new Array(1, 2, 3, 4, 5, 6).sort(my_cmp)6,5,4,3,2,1
  js> new Array("foo", "bar", "baz").sort()
  bar,baz,foo

これも(python ぽく)破壊的か

!2006-08-14 Mon

  js> a = new Array(1, 2, 3, 4, 5, 6)
  1,2,3,4,5,6
  js> a.splice(0, 0)
  
  js> a
  1,2,3,4,5,6
  js> a.splice(0, 1)
  1
  js> a
  2,3,4,5,6
  js> a.splice(0, 1, 10, 20)
  2
  js> a
  10,20,3,4,5,6

!2006-08-13 Sun

  js> a = new Array(1, 2, 3, 4, 5, 6)
  1,2,3,4,5,6
  js> a.slice(0, 0)
  
  js> a
  1,2,3,4,5,6
  js> a.slice(0, 1)
  1
  js> a
  1,2,3,4,5,6
  js> a.slice(0, 2)
  1,2
  js> a
  1,2,3,4,5,6
  js> a.slice(0, 2, 10)
  1,2
  js> a
  1,2,3,4,5,6
  js> a.slice(0, 2, 10, 11)
  1,2
  js> a
  1,2,3,4,5,6
？と思ったら、splice と slice を間違えた…

引数が多くても文句言わないんだな〜

!2006-08-12 Sat

  js> a = new Array(1, 2, 3)
  1,2,3
  js> a.pop()
  3
  js> a
  1,2

!2006-08-11 Fri

  js> a = new Array(1, 2, 3)
  1,2,3
  js> a.shift
  
  function shift() {
      [native code]
  }
  
  js> a.shift()
  1
  js> a
  2,3

!2006-08-10 Thu

  js> a = new Array(1, 2, 3)
  1,2,3
  js> a.push(4)
  4
  js> a
  1,2,3,4
  js> a = new Array(1, 2, 3)
  1,2,3
  js> a.push(4,5,6)
  6
  js> a
  1,2,3,4,5,6

!2006-08-09 Wed

  js> new Array(1, 2, 3).unshift(4)
  4
  js> a = new Array(1, 2, 3)
  1,2,3
  js> a.unshift(4)
  4
  js> a
  4,1,2,3
  js> a.unshift(-3,-2,-1,0)
  7
  js> a
  -3,-2,-1,0,1,2,3

めずらしく、中身が更新されるようだ

!2006-08-08 Tue

そもそも、[ ] でも表記できるっぽいのだが、、
  js> [1, 2, 3]
  1,2,3
  js> [1]
  1
  js> typeof([1])
  object
  js> typeof([1, 2])
  object

!2006-08-07 Mon

  js> new Array("foo", "bar", "baz").join(":")
  foo:bar:baz
  js> new Array("foo", "bar", "baz").join()
  foo,bar,baz
  js> new Array(1, 2, 3).join()
  1,2,3
  js> new Array(1, 2, 3).join(":")
  1:2:3

!2006-08-06 Sun

  js> a = new Array(1,2,3)
  1,2,3
  js> a.concat(new Array(4,5,6))
  1,2,3,4,5,6
  js> a
  1,2,3
  js> a.concat(new Array(4,5,6), new Array(7,8,9))
  1,2,3,4,5,6,7,8,9

!2006-08-05 Sat

  js> a = new Array()
  
  js> a["foo"] = 1
  1
  js> a[0] = 10
  10
  js> a
  10
？
  js> a["foo"]
  1
  js> a[0]
  10

!2006-08-04 Fri

  js> a = new Array()
  
  js> a[0] = new Array()
  
  js> a[0][0] = 1
  1
  js> a[0][1] = 1
  1
  js> a[1] = 2
  2
  js> a
  1,1,2
  js> a[2][0]
  11: TypeError: a[2] has no properties

!2006-08-03 Thu

  js> new Array()
  
  js> a = new Array()
  
  js> typeof(a)
  object
  js> new Array(1)
  
  js> new Array(2)
  ,
  js> new Array(3)
  ,,
  js> a = new Array(3)
  ,,
  js> a[3]
  js> a[4]
  js> new Array(1, 2, 3)
  1,2,3
  js> new Array(1, 2, 3, "foo", "bar", "baz")
  1,2,3,foo,bar,baz
  js> new Array().length
  0
  js> new Array(1).length
  1
  js> new Array(2).length
  2
  js> new Array(1,2,3).length
  3

!2006-08-02 Wed

  js> true
  true
  js> false
  false
  js> new Boolean(true)
  true
  js> new Boolean(false)
  false
  js> new Boolean(1)
  true
  js> new Boolean(0)
  false
  js> new Boolean("a")
  true
  js> new Boolean("")
  false
  js> new Boolean(new Boolean(false))
  true

!2006-08-01 Tue

  js> "foo".match(/\w+/)
  foo
  js> "foo".match('\w+')
  null
  js> "foo".match("\\w+")
  foo
  
  js> "foo".search(/\w+/)
  0
  js> "foo".search('\w+')
  -1
  js> "foo".search('\\w+')
  0

!2006-07-31 Mon

  js> "foo".toLocaleUpperCase()
  FOO
  js> "FOO".toLocaleLowerCase()
  foo

!2006-07-30 Sun

  js> "abc".localeCompare("abc")
  0
  js> "abc".localeCompare("abcd")
  -1
  js> "abc".localeCompare("ABC")
  32
  js> "abc".localeCompare("aaa")
  1

!2006-07-29 Sat

  js> "abc".bold()
  <b>abc</b>
  js> "abc".italics()
  <i>abc</i>
  js> "abc".fixed()
  <tt>abc</tt>
  js> "abc".big()
  <big>abc</big>
  js> "abc".small()
  <small>abc</small>
  js> "abc".blink()
  <blink>abc</blink>
  js> "abc".strike()
  <strike>abc</strike>
  js> "abc".sup()
  <sup>abc</sup>
  js> "abc".sub()
  <sub>abc</sub>
  js> "abc".fontcolor("blue")
  <font color="blue">abc</font>
  js> "abc".fontcolor("hoge")
  <font color="hoge">abc</font>
  js> "abc".fontsize(10)
  <font size="10">abc</font>
  js> "abc".anchor("hoge")
  <a name="hoge">abc</a>
  js> "abc".link("hoge")
  <a href="hoge">abc</a>

!2006-07-28 Fri

  js> String.fromCharCode()
  
  js> String.fromCharCode(97)
  a
  js> String.fromCharCode(97, 98, 99)
  abc

!2006-07-27 Thu

  js> "abc".charCodeAt(0)
  97
  js> "abc".charCodeAt(-1)
  NaN
  js> "abc".charCodeAt(10)
  NaN
  js> "あ".charCodeAt(0)
  164

!2006-07-26 Wed

  js> "foo".search(/\w+/)
  0
  js> "foo".search(/\d+/)
  -1
  js> "foo1".search(/\d+/)
  3
  js> "foo bar".search(/(\S+)\s+(\S+)/)
  0

!2006-07-25 Tue

  js> "foo".match(/\w+/)
  foo
  js> "foo".match(/\d+/)
  null
  js> "foo1".match(/\d+/)
  1
  js> "foo bar".match(/(\S+)\s+(\S+)/)
  foo bar,foo,bar
  js> a = "foo bar".match(/(\S+)\s+(\S+)/)
  foo bar,foo,bar
  js> a[0]
  foo bar
  js> a[1]
  foo
  js> a[2]
  bar

!2006-07-24 Mon

  js> "abcabc".lastIndexOf("a")
  3
  js> "abcabc".lastIndexOf("a", 1)
  0
  js> "abcabc".lastIndexOf("d")
  -1
  js> "abcabc".lastIndexOf("a", 10)
  3
  js> "abcabc".lastIndexOf("a", -1)
  0

!2006-07-23 Sun

  js> "abcabc".indexOf("a")
  0
  js> "abcabc".indexOf("a", 1)
  3
  js> "abcabc".indexOf("d")
  -1
  js> "abcabc".indexOf("a", 10)
  -1
  js> "abcabc".indexOf("a", -1)
  0

!2006-07-22 Sat

  js> "FOO".toLowerCase()
  foo
  js> x = "FOO"; x.toLowerCase(); x
  FOO

!2006-07-21 Fri

  js> "foo".toUpperCase()
  FOO
  js> x = "foo"; x.toUpperCase(); x
  foo

!2006-07-20 Thu

  js> "foo".replace("f", "b")
  boo
  js> x = "foo"; x.replace("f", "b")
  boo
  js> x
  foo
  js> "foo1".replace(/\d+/, "")
  foo

!2006-07-19 Wed

  js> "foo".concat("bar")
  foobar
  js> x = "foo"
  foo
  js> x.concat("bar")
  foobar
  js> x
  foo
うむ。

!2006-07-18 Tue

  js> "foo bar baz".split()
  foo bar baz
  js> "foo bar baz".split(" ")
  foo,bar,baz
  js> "foo  bar  baz".split(" ")
  foo,,bar,,baz
  js> "foo bar baz".split(" ", 1)
  foo
  js> a = "foo bar baz".split(" ")
  foo,bar,baz
  js> a[0]
  foo
  js> a[1]
  bar
  js> a[2]
  baz
  js> a[3]

!2006-07-17 Mon

  js> "abc".substr(0)
  abc
  js> "abc".substr(1)
  bc
  js> "abc".substr(2)
  c
  js> "abc".substr(0, 1)
  a
  js> "abc".substr(0, 2)
  ab
  js> "abc".substr(0, 5)
  abc
  js> "abc".substr(1, 0)
  
  js> "abc".substr(1, 1)
  b
  js> "abc".substr(1, 2)
  bc
  js> "abc".substr(-1, 2)
  c
  js> "abc".substr(-1)
  c
  js> "abc".substr(-2)
  bc
  js> "abc".substr(-5)
  abc
  js> "abc".substr(-5, 1)
  a
  js> "abc".substr(-5, 2)
  ab

!2006-07-16 Sun

  js> "abc".slice(0, 1)
  a
  js> "abc".slice(0, 2)
  ab
  js> "abc".slice(0, 3)
  abc
  js> "abc".slice(0, 4)
  abc
  js> "abc".slice(0, -1)
  ab
  js> "abc".slice(0, -2)
  a
  js> "abc".slice(-1)
  c
  js> "abc".slice(-1, -2)
  
  js> "abc".slice(-2, -1)
  b

微妙な…

!2006-07-15 Sat

  js> "abc".substring(0, 1)
  a
  js> "abc".substring(0, 2)
  ab
  js> "abc".substring(1, 0)
  a
  js> "abc".substring(1)
  bc
  js> "abc".substring(1, 1)
  
  js> "abc".substring(1, 2)
  b
  js> "abc".substring(1, 3)
  bc
  js> "abc".substring(1, 4)
  bc
  js> "abc".substring(1, -1)
  a
  js> "abc".substring(1, -2)
  a
  js> "abc".substring(-1, 1)
  a
  js> "abc".substring(-1, 2)
  ab
  js> "abc".substring(-1, 3)
  abc
  js> "abc".substring(0)
  abc
  js> "abc".substring(-1)
  abc

!2006-07-14 Fri

  js> "abc".charAt(0)
  a
  js> "abc".charAt(-1)
  
  js> "abc".charAt(4)
  
  js> "あいう".charAt(0)
  
  js> "あいう".charAt(1)
  

!2006-07-13 Thu

  js> "foo".length
  3
  js> "あ".length
  2
  js> "\u3042".length
  1

!2006-07-12 Wed

  js> "あ"
  あ
  js> "表"
  表
  js> String("foo")
  foo
  js> new String("foo")
  foo
  js> typeof(String("foo"))
  string
  js> typeof(new String("foo"))
  object
  js> typeof("foo")
  string
  js> (new String("foo")).length
  3

!2006-07-11 Tue

  js> "foo"
  foo
  js> "foo\tbar"
  foo     bar
  js> 'foo\tbar'
  foo     bar

!2006-07-10 Mon

  js> Number(10/3).toPrecision(3)
  3.33
  js> Number(10/3).toPrecision()
  3.3333333333333335

!2006-07-09 Sun

  js> Number(10/3).toExponential(3)
  3.333e+0
  js> Number(10/3).toExponential()
  3.3333333333333335e+0

!2006-07-08 Sat

  js> 10/3
  3.3333333333333335
  js> Number(10/3).toFixed(3)
  3.333
  js> Number(10/3).toFixed()
  3

!2006-07-07 Fri

  js> 1.valueOf()
  1: SyntaxError: missing ; before statement:
  1: 1.valueOf()
  1: ..^
  js> x = 1; x.valueOf()
  1
  js> Number(1).valueOf()
  1

!2006-07-06 Thu

  js> Number.MAX_VALUE
  1.7976931348623157e+308
  js> Number.MIN_VALUE
  5e-324
  js> Number.POSITIVE_INFINITY
  Infinity
  js> Number.NEGATIVE_INFINITY
  -Infinity

!2006-07-05 Wed

  js> Number.NaN
  NaN
  js> NaN
  NaN
  js> Number.NaN == NaN
  false
  js> Number.NaN == Number.NaN
  false
  js> isNaN(Number.NaN)
  true
  js> isNaN(NaN)
  true

!2006-07-04 Tue

  js> 10.toString(2)
  3: SyntaxError: missing ; before statement:
  3: 10.toString(2)
  3: ...^
  js> x = 10; x.toString(2)
  1010
  js> x = 10; x.toString(8)
  12
  js> x = 10; x.toString(16)
  a

!2006-07-03 Mon

  js> "3" - 0
  3
  js> "3"
  3
  js> "abc"
  abc

!2006-07-02 Sun

  js> new Number(1)
  1
  js> typeof(1)
  number
  js> typeof(new Number(1))
  object

!2006-07-01 Sat

  js> taint()
  1: ReferenceError: taint is not defined
  js> untaint()
  2: ReferenceError: untaint is not defined

!2006-06-30 Fri

  js> eval("1+2+3")
  6

!2006-06-29 Thu

  js> isFinite(1)
  true
  js> isFinite(999999999999999999999999)
  true
  js> isFinite("a")
  false
  js> Math.log(0)
  -Infinity
  js> isFinite(Math.log(0))
  false

!2006-06-28 Wed

  js> isNaN(1)
  false
  js> isNaN(parseInt("A"))
  true
  js> isNaN("a")
  true

!2006-06-27 Tue

  js> unescape(escape(" %+"))
   %+
  js> unescape(escape(escape("あいう")))
  %A4%A2%A4%A4%A4%A6

!2006-06-26 Mon

  js> escape(" %+")
  %20%25+
  js> escape("あいう")
  %A4%A2%A4%A4%A4%A6

!2006-06-25 Sun

  js> String(1)
  1
  js> String(1.2)
  1.2
  js> String(1.2e-2)
  0.012

!2006-06-24 Sat

  js> parseInt("1")
  1
  js> parseInt("1a")
  1
  js> parseInt("1.2")
  1
  js> parseInt("A")
  NaN
  js> parseInt("0x1")
  1
  js> parseInt("0x10")
  16
  js> parseInt("010")
  8
  js> parseInt("10", 10)
  10
  js> parseInt("10", 8)
  8
  js> parseInt("10", 16)
  16

!2006-06-23 Fri

  js> parseFloat("1.2")
  1.2
  js> parseFloat("123")
  123
  js> parseFloat("1.2e-3")
  0.0012
  js> parseFloat("1.2a")
  1.2
  js> parseFloat("0x1")
  0
  js> parseFloat("A")
  NaN

!2006-06-22 Thu

  js> Number(1)
  1
  js> Number("1")
  1
  js> Number("1+2")
  NaN
  js> Number("2006-06-22")
  NaN
  js> Number(1 + "2")
  12
  js> Number("2" - 0 + 1)
  3
  js> Number(new Date())
  1150945972227

!2006-06-21 Wed

  js> true
  true
  js> false
  false
  js> null
  null
  js> undefined
  js> NaN
  NaN
  js> Infinity
  Infinity

!2006-06-20 Tue

  js> "foo"
  foo
  js> 'foo'
  foo

!2006-06-19 Mon

  js> 1
  1
  js> 1.2
  1.2
  js> 1.2e3
  1200
  js> 1.2e-3
  0.0012
  js> 010
  8
  js> 0x10
  16

  js> 0x01e1
  481
？

!2006-06-18 Sun

  js> !0
  true
  js> !"0"
  false
  js> !""
  true
  js> !1
  false
  js> !"1"
  false
下手すると、はまる？

  js> "0" & "0"
  0
  js> "1" & "1"
  1

!2006-06-17 Sat

  js> x = 1
  1
  js> x += 2
  3
  js> x
  3
  js> x = 1; x -= 2; x
  -1
  js> x = 2; x *= 3; x
  6
  js> x = 10; x /= 3; x
  3.3333333333333335
  js> x = 10; x %= 3; x
  1
  js> x = 7; x &= 3
  3
  js> x = 7; x |= 3
  7
  js> x = 7; x ^= 3
  4
  js> x = 3; x <<= 1
  6
  js> x = 3; x >>= 1
  1
  js> x = 0xffffffff; x >>>= 30
  3
  js> x = 0xffffffff; x >>= 30
  -1

!2006-06-16 Fri

  js> 1 << 2
  4
  js> 7 >> 1
  3
  js> 7 >>> 1
  3
  js> 0xffffffff >> 1
  -1
  js> 0xffffffff >>> 1
  2147483647
  js> 0xffffffff >>> 30
  3
  js> 0xffffffff >> 30
  -1
  js> "1" << "2"
  4
  js> "7" >> "1"
  3
  js> "7" >>> "1"
  3

!2006-06-15 Thu

  js> 15 & 7
  7
  js> 15 | 7
  15
  js> 15 ^ 7
  8
  js> ~15
  -16
  js> "15" & "7"
  7
  js> "15" | "7"
  15
  js> "15" ^ "7"
  8
  js> ~"15"
  -16

!2006-06-14 Wed

  js> 1, 2
  2
  js> 1, 2, 3
  3
  js> x = 1, 2
  2
  js> x
  1

!2006-06-13 Tue

  js> true ? "foo" : "bar"
  foo
  js> false ? "foo" : "bar"
  bar

!2006-06-12 Mon

  js> !true
  false
  js> !false
  true

!2006-06-11 Sun

  js> true || false
  true
  js> false || false
  false

!2006-06-10 Sat

  js> true && true
  true
  js> true && false
  false

!2006-06-09 Fri

  js> 1 == "1"
  true
  js> 1 === "1"
  false
  js> 1 != "2"
  true
  js> 1 !== "2"
  true

!2006-06-08 Thu

  js> "abc" <= "abc"
  true
  js> "def" <= "abc"
  false

!2006-06-07 Wed

  js> 1 <= 1
  true
  js> 1 <= 2
  true
  js> 2 <= 1
  false

!2006-06-06 Tue

  js> "foo" == "foo";
  true
  js> "foo" == "bar";
  false
  js> "foo" != "foo";
  false
  js> "foo" != "bar";
  true

!2006-06-05 Mon

  js> 1 == 1;
  true
  js> 1 == 2;
  false
  js> 1 != 1;
  false
  js> 1 != 2;
  true

!2006-06-04 Sun

  js> x = 1;
  1
  js> x++;
  1
  js> x
  2
  
  js> x = 1;
  1
  js> ++x;
  2
  js> x
  2
  
  js> x = 1;
  1
  js> x--;
  1
  js> x
  0

!2006-06-03 Sat

  js> "foo" + "bar";
  foobar
  js> "foo" * 3;
  NaN

!2006-06-02 Fri

  js> 1 + 2;
  3
  js> 1 - 2;
  -1
  js> 2 * 3;
  6
  js> 4 / 2;
  2
  js> 10 % 3;
  1
  js> 10 % -3;
  1

!2006-06-01 Thu

  js> x = 1;
  1
  js> x
  1