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                ## transform + [link](./transform "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L11780 "View in source.") + [npm](https://www.npmjs.com/package/lodash.transform "See the npm package.") ``` _.transform(object, [iteratee=_.identity], [accumulator]) ``` `_.reduce` 的代替方法。 這個方法會改變對象為一個新的 `accumulator` 對象,來自每一次經 `iteratee` 處理自身可枚舉對象的結果。 每次調用可能會改變 `accumulator` 對象。 iteratee 會傳入4個對象:(accumulator, value, key, object)。 如果返回 `false`,iteratee 會提前退出。 ### 參數 1. object (Array|Object) 要遍歷的對象 2. [iteratee=_.identity] (Function) 這個函數會處理每一個元素 3. [accumulator] (\*) 定制疊加的值 ### 返回值 (\*) 返回疊加后的值 ### 示例 ``` _.transform([2, 3, 4], function(result, n) { result.push(n *= n); return n % 2 == 0; }, []); // => [4, 9] _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { (result[value] || (result[value] = [])).push(key); }, {}); // => { '1': ['a', 'c'], '2': ['b'] } ```
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