[zh-TW]: update Array.prototype.find()
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(comment last updated: 2025-04-23 05:19:35) |
yin1999
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Apr 22, 2025
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| **`find()`** 方法會回傳第一個滿足所提供之測試函式的元素**值**。否則回傳 {{jsxref("undefined")}}。 | ||
| {{jsxref("Array")}} 實例的 **`find()`** 方法會回傳在提供的陣列中，第一個通過所提供測試函式的元素。如果沒有任何值通過測試函式，則回傳 {{jsxref("undefined")}}。 |
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我觉得 {{jsxref("Array")}} 實例的 **find()** 方法會回傳在提供的陣列中，第一個通過所提供測試函式的元素 中间的逗号有点割裂语义
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| `callback` 函式被呼叫時會傳入三個參數：元素的值、元素索引，以及正被迭代的陣列物件。 | ||
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| 如果提供 `thisArg` 參數予 `find`，其將會被當作 `callback` 每次被呼叫的 `this`。若是沒提供，則會使用 {{jsxref("undefined")}}。 | ||
| `find()` 方法是一個[迭代方法](/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Array#迭代方法)。它會以索引遞增順序對陣列中的每個元素執行一次所提供的 `callbackFn` 函式，直到 `callbackFn` 回傳一個 [truthy](/zh-TW/docs/Glossary/Truthy) 值。此時，`find()` 會回傳該元素並停止迭代陣列。若 `callbackFn` 未曾回傳 truthy 值，則 `find()` 會回傳 {{jsxref("undefined")}}。請參閱[迭代方法](/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Array#迭代方法)部分以深入了解這些方法的運作方式。 |
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| - {{jsxref("Array.prototype.every()")}} – test all elements together | ||
| - [在 `core-js` 中 `Array.prototype.find` 的 Polyfill](https://github.com/zloirock/core-js#ecmascript-array) | ||
| - [`Array.prototype.find` 的 es-shims polyfill](https://www.npmjs.com/package/array.prototype.find) | ||
| - [索引集合](/zh-TW/docs/Web/JavaScript/Guide/Indexed_collections)教學 |
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Dr-XYZ
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Co-authored-by: A1lo <yin199909@aliyun.com>
yin1999
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Apr 23, 2025
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