ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
39 lines
1.2 KiB
Markdown
39 lines
1.2 KiB
Markdown
---
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id: 587d825b367417b2b2512c8d
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title: 创建ES6 JavaScript地图
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challengeType: 1
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videoUrl: ''
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dashedName: create-an-es6-javascript-map
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---
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# --description--
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新版本的JavaScript为我们提供了一个内置的Map对象，它提供了我们在上一次挑战中手工编写的大部分功能。此Map对象虽然与常规JavaScript对象类似，但它提供了一些普通对象缺少的有用功能。例如，ES6 Map跟踪添加到其中的项目的插入顺序。以下是其方法的更完整概述： `.has(key)`基于键的存在返回true或false `.get(key)`返回与键相关联的值`.set(key, value)`设置新键，值对`.delete(key)`删除一个键，值对`.clear()`删除所有键值对`.entries()`以插入顺序返回所有键的数组`.values()`返回插入中所有值的数组order说明：定义一个JavaScript Map对象并为其分配一个名为myMap的变量。添加密钥，值对`freeCodeCamp` ， `Awesome!`它。
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# --hints--
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myMap对象存在。
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```js
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assert(typeof myMap === 'object');
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```
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myMap包含键值对`freeCodeCamp` ， `Awesome!` 。
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```js
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assert(myMap.get('freeCodeCamp') === 'Awesome!');
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```
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# --seed--
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## --seed-contents--
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```js
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```
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# --solutions--
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```js
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// solution required
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```
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