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## mergeWith 

+ [link](./mergeWith "Link to this entry.") 
+ [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L11516 "View in source.") 
+ [npm](https://www.npmjs.com/package/lodash.mergewith "See the npm package.")

```
_.mergeWith(object, sources, customizer)
```

這個方法類似 `_.merge`。 除了它接受一個 `customizer` 決定如何合并。 如果 `customizer` 返回 `undefined` 將會由合并處理方法代替。

### 參數

1.  object (Object)

    目標對象

2.  sources (...Object)

    來源對象

3.  customizer (Function)

    這個方法決定如何合并

### 返回值 (Object)

返回對象

### 示例

```
function customizer(objValue, srcValue) {
  if (_.isArray(objValue)) {
    return objValue.concat(srcValue);
  }
}

var object = {
  'fruits': ['apple'],
  'vegetables': ['beet']
};

var other = {
  'fruits': ['banana'],
  'vegetables': ['carrot']
};

_.mergeWith(object, other, customizer);
// => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] } 
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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