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fix typo

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ruanyf 2015-11-12 19:51:23 +08:00
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@ -49,7 +49,7 @@ ECMAScript 6规格的26章之中，第1章到第3章是对文件本身的介绍
> 1. If `Type(x)` is Number and `Type(y)` is String,
> return the result of the comparison `x == ToNumber(y)`.
> 1. If `Type(x)` is String and `Type(y)` is Number,
> return the result of the comparison ToNumber(x) == y.
> return the result of the comparison `ToNumber(x) == y`.
> 1. If `Type(x)` is Boolean, return the result of the comparison `ToNumber(x) == y`.
> 1. If `Type(y)` is Boolean, return the result of the comparison `x == ToNumber(y)`.
> 1. If `Type(x)` is either String, Number, or Symbol and `Type(y)` is Object, then
@ -73,7 +73,7 @@ ECMAScript 6规格的26章之中，第1章到第3章是对文件本身的介绍
> 1. 如果`Type(x)`是对象，`Type(y)`是字符串或数值或`Symbol`值，返回`ToPrimitive(x) == y`的结果。
> 1. 返回`false`。
由于`0`的类型是数值，`null`的类型是Null（这是规格[4.3.13小节](http://www.ecma-international.org/ecma-262/6.0/#sec-4.3.13)的规定，是内部Type运算的结果，跟`typeof`运算符无关）。因此上面的前11步运算步骤都得不到结果，要到第12步才能得到`false`。
由于`0`的类型是数值，`null`的类型是Null（这是规格[4.3.13小节](http://www.ecma-international.org/ecma-262/6.0/#sec-4.3.13)的规定，是内部Type运算的结果，跟`typeof`运算符无关）。因此上面的前11步都得不到结果，要到第12步才能得到`false`。
```javascript
0 == null // false
@ -139,27 +139,27 @@ a2.map(n => 1) // [, , ,]
后面的算法描述是这样的。
> 1. Let `O` be `ToObject(this value)`.
> 1. ReturnIfAbrupt(O).
> 1. Let len be ToLength(Get(O, "length")).
> 1. ReturnIfAbrupt(len).
> 1. If IsCallable(callbackfn) is false, throw a TypeError exception.
> 1. If thisArg was supplied, let T be thisArg; else let T be undefined.
> 1. Let A be ArraySpeciesCreate(O, len).
> 1. ReturnIfAbrupt(A).
> 1. Let k be 0.
> 1. Repeat, while k < len
> a. Let Pk be ToString(k).
> b. Let kPresent be HasProperty(O, Pk).
> c. ReturnIfAbrupt(kPresent).
> d. If kPresent is true, then
> d-1. Let kValue be Get(O, Pk).
> d-2. ReturnIfAbrupt(kValue).
> d-3. Let mappedValue be Call(callbackfn, T, «kValue, k, O»).
> d-4. ReturnIfAbrupt(mappedValue).
> d-5. Let status be CreateDataPropertyOrThrow (A, Pk, mappedValue).
> d-6. ReturnIfAbrupt(status).
> e. Increase k by 1.
> 1. Return A.
> 1. `ReturnIfAbrupt(O)`.
> 1. Let `len` be `ToLength(Get(O, "length"))`.
> 1. `ReturnIfAbrupt(len)`.
> 1. If `IsCallable(callbackfn)` is `false`, throw a TypeError exception.
> 1. If `thisArg` was supplied, let `T` be `thisArg`; else let `T` be `undefined`.
> 1. Let `A` be `ArraySpeciesCreate(O, len)`.
> 1. `ReturnIfAbrupt(A)`.
> 1. Let `k` be 0.
> 1. Repeat, while `k` < `len`
> a. Let `Pk` be `ToString(k)`.
> b. Let `kPresent` be `HasProperty(O, Pk)`.
> c. `ReturnIfAbrupt(kPresent)`.
> d. If `kPresent` is `true`, then
> d-1. Let `kValue` be `Get(O, Pk)`.
> d-2. `ReturnIfAbrupt(kValue)`.
> d-3. Let `mappedValue` be `Call(callbackfn, T, «kValue, k, O»)`.
> d-4. `ReturnIfAbrupt(mappedValue)`.
> d-5. Let `status` be `CreateDataPropertyOrThrow (A, Pk, mappedValue)`.
> d-6. `ReturnIfAbrupt(status)`.
> e. Increase `k` by 1.
> 1. Return `A`.
翻译如下。