Check if a method exists from an object nested using lodash

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>