91 lines
2.0 KiB
Markdown
91 lines
2.0 KiB
Markdown
---
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id: 587d7daa367417b2b2512b6c
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title: 使用 join 方法将数组组合成字符串
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challengeType: 1
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forumTopicId: 18221
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dashedName: combine-an-array-into-a-string-using-the-join-method
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---
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# --description--
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`join` 方法用来把数组中的所有元素放入一个字符串。 并通过指定的分隔符参数进行分隔。
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举个例子：
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```js
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var arr = ["Hello", "World"];
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var str = arr.join(" ");
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```
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`str` 的值应该是字符串 `Hello World`。
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# --instructions--
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在函数 `sentensify` 内用 `join` 方法（及其他方法）用字符串 `str` 中的单词造句，这个函数应返回一个字符串。 该函数应返回一个数组。 举个例子，`I-like-Star-Wars` 会被转换成 `I like Star Wars`。 在此挑战中请勿使用 `replace` 方法。
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# --hints--
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应使用 `join` 方法。
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```js
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assert(code.match(/\.join/g));
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```
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不能使用 `replace` 方法。
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```js
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assert(!code.match(/\.?[\s\S]*?replace/g));
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```
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`sentensify("May-the-force-be-with-you")` 应返回一个字符串。
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```js
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assert(typeof sentensify('May-the-force-be-with-you') === 'string');
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```
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`sentensify("May-the-force-be-with-you")` 应返回 `May the force be with you`。
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```js
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assert(sentensify('May-the-force-be-with-you') === 'May the force be with you');
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```
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`sentensify("The.force.is.strong.with.this.one")` 应返回 `The force is strong with this one`。
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```js
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assert(
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sentensify('The.force.is.strong.with.this.one') ===
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'The force is strong with this one'
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);
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```
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`sentensify("There,has,been,an,awakening")` 应返回 `There has been an awakening`。
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```js
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assert(
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sentensify('There,has,been,an,awakening') === 'There has been an awakening'
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function sentensify(str) {
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// Only change code below this line
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// Only change code above this line
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}
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sentensify("May-the-force-be-with-you");
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```
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# --solutions--
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```js
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function sentensify(str) {
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// Only change code below this line
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return str.split(/\W/).join(' ');
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// Only change code above this line
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}
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```
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