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>
77 lines
1.6 KiB
Markdown
77 lines
1.6 KiB
Markdown
---
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id: 587d7dab367417b2b2512b6e
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title: 使用 every 方法检查数组中的每个元素是否符合条件
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challengeType: 1
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forumTopicId: 301312
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dashedName: use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria
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---
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# --description--
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`every`方法用于检测数组中*所有*元素是否都符合指定条件。如果所有元素满足条件，返回布尔值`true`，反之返回`false`。
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举个例子，下面的代码检测数组`numbers`的所有元素是否都小于 10：
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```js
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var numbers = [1, 5, 8, 0, 10, 11];
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numbers.every(function(currentValue) {
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return currentValue < 10;
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});
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// Returns false
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```
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# --instructions--
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在`checkPositive`函数中使用`every`方法检查`arr`中是否所有元素都是正数，函数应返回一个布尔值。
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# --hints--
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应使用`every`方法。
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```js
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assert(code.match(/\.every/g));
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```
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`checkPositive([1, 2, 3, -4, 5])`应返回`false`。
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```js
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assert.isFalse(checkPositive([1, 2, 3, -4, 5]));
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```
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`checkPositive([1, 2, 3, 4, 5])`应返回`true`。
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```js
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assert.isTrue(checkPositive([1, 2, 3, 4, 5]));
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```
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`checkPositive([1, -2, 3, -4, 5])`应返回`false`。
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```js
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assert.isFalse(checkPositive([1, -2, 3, -4, 5]));
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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 checkPositive(arr) {
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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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checkPositive([1, 2, 3, -4, 5]);
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```
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# --solutions--
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```js
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function checkPositive(arr) {
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// Only change code below this line
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return arr.every(num => num > 0);
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// Only change code above this line
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}
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checkPositive([1, 2, 3, -4, 5]);
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```
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