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                ## forEach each + [link](./forEach "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L7702 "View in source.") + [npm](https://www.npmjs.com/package/lodash.foreach "See the npm package.") ``` _.forEach(collection, [iteratee=_.identity]) ``` 調用 iteratee 遍歷集合中的元素, iteratee 會傳入3個參數:(value, index|key, collection)。 如果顯式的返回 false ,iteratee 會提前退出。 **注意:** 與其他集合方法一樣,對象的 length 屬性也會被遍歷,避免這種情況,可以用 _.forIn 或者_ .forOwn 代替。 ### 參數 1. collection (Array|Object) 需要遍歷的集合 2. [iteratee=_.identity] (Function) 這個函數會處理每一個元素 ### 返回值 (Array|Object) 返回集合 ### 示例 ``` _([1, 2]).forEach(function(value) { console.log(value); }); // => 輸出 `1` 和 `2` _.forEach({ 'a': 1, 'b': 2 }, function(value, key) { console.log(key); }); // => 輸出 'a' 和 'b' (不保證遍歷的順序) ```
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