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## keyBy 

+ [link](./keyBy "Link to this entry.") 
+ [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L7856 "View in source.") 
+ [npm](https://www.npmjs.com/package/lodash.keyby "See the npm package.")

```
_.keyBy(collection, [iteratee=_.identity])
```

創建一個對象組成。key 是經 `iteratee` 處理的結果，value 是產生key的元素。 iteratee 會傳入1個參數：(value)。

### 參數

1.  collection (Array|Object)

    需要遍歷的集合

2.  [iteratee=_.identity] (Function|Object|string)

    這個函數會處理每一個元素

### 返回值 (Object)

返回一個組成匯總的對象

### 示例

```
var array = [
  { 'dir': 'left', 'code': 97 },
  { 'dir': 'right', 'code': 100 }
];

_.keyBy(array, function(o) {
  return String.fromCharCode(o.code);
});
// => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }

_.keyBy(array, 'dir');
// => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } 
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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