检查使用lodash嵌套的对象中是否存在方法

Question

For example,

check if isCourage() method exist in such object.

puppy {

  ...

  goldenRetriever {

     ...

     hasCourage(){ ... }

  }

}

Lodash can do the trick but i'm not sure which method should i use.

Answer 1

With lodash you have a few functions that might be helpful to you:

You can use _.isFunction with _.get :

 let obj = { foo:{ bar:{ fooBar: function(b) { return b } } } } console.log(_.isFunction(_.get(obj,'foo.bar.fooBar'))) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script> 

You can also use _.result to get the value right away and not care really if it is or not a function. _.result would walk the path executing anything that is a function and return the final value:

 let obj = { foo:{ bar:{ fooBar: function(b='yay') { return b } } } } console.log(_.result(obj, 'foo.bar.fooBar')) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script> 

Answer 2

You can use

_.get(puppy,'bar.goldenRetrieve.foo.hasCorauge.constructor') === Function

(bar and foo are examples since ... would be confusing and .contructor should return Function if it is a function...)

 let obj = { foo:{ bar:{ myFn:function(b){return b;} } } } console.log(_.get(obj,'foo.bar.myFn.constructor')===Function); console.log(_.get(obj,'foo.bar.myFn2.constructor')===Function); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>