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## countBy 

+ [link](./countBy "Link to this entry.") 
+ [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L7504 "View in source.") 
+ [npm](https://www.npmjs.com/package/lodash.countby "See the npm package.")

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

創建一個組成對象，key是經過 `iteratee` 處理的集合的結果，value 是處理結果的次數。 `iteratee` 會傳入一個參數：(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

```
_.countBy([6.1, 4.2, 6.3], Math.floor);
// => { '4': 1, '6': 2 }

_.countBy(['one', 'two', 'three'], 'length');
// => { '3': 2, '5': 1 } 
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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