2021-05-05 10:13:49 -07:00
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---
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id: 587d7dab367417b2b2512b6f
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title: 使用 some 方法檢查數組中是否有元素是否符合條件
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challengeType: 1
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forumTopicId: 301314
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dashedName: use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria
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---
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# --description--
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`some` 方法用於檢測數組中*任何*元素是否滿足指定條件。 如果有一個元素滿足條件,返回布爾值 `true`,反之返回 `false`。
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舉個例子,下面的代碼檢測數組`numbers`中是否有元素小於 10:
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```js
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2021-10-27 15:10:57 +00:00
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const numbers = [10, 50, 8, 220, 110, 11];
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2021-05-05 10:13:49 -07:00
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numbers.some(function(currentValue) {
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return currentValue < 10;
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});
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```
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`some` 方法將返回 `true`。
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# --instructions--
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在 `checkPositive` 函數值中使用 `some` 檢查 `arr` 中是否有元素爲正數。 函數應返回一個布爾值。
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# --hints--
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應該使用 `some` 方法。
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```js
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assert(code.match(/\.some/g));
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```
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`checkPositive([1, 2, 3, -4, 5])` 應返回 `true`。
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```js
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assert(checkPositive([1, 2, 3, -4, 5]));
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```
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`checkPositive([1, 2, 3, 4, 5])` 應返回 `true`。
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```js
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assert(checkPositive([1, 2, 3, 4, 5]));
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```
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`checkPositive([-1, -2, -3, -4, -5])` 應返回 `false`。
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```js
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assert(!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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2021-10-27 15:10:57 +00:00
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2021-05-05 10:13:49 -07:00
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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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return arr.some(elem => elem > 0);
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}
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```
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