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                ## invertBy + [link](./invertBy "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L11279 "View in source.") + [npm](https://www.npmjs.com/package/lodash.invertby "See the npm package.") ``` _.invertBy(object, [iteratee=_.identity]) ``` 這個方法類似 `_.invert`。 除了它接受 iteratee 調用每一個元素,可在返回值中定制key。 iteratee 會傳入1個參數:(value)。 ### 參數 1. object (Object) 要倒置的對象 2. [iteratee=_.identity] (Function|Object|string) 這個函數會調用每一個元素 ### 返回值 (Object) 返回新的倒置的對象 ### 示例 ``` var object = { 'a': 1, 'b': 2, 'c': 1 }; _.invertBy(object); // => { '1': ['a', 'c'], '2': ['b'] } _.invertBy(object, function(value) { return 'group' + value; }); // => { 'group1': ['a', 'c'], 'group2': ['b'] } ```
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