CODEWITHSUNDEEP
javascript
Harry
Harry

Reputation: 1347

How can I debug variable of [Function] type?

Some functions are set into variables. And I want to debug what kind of function is set there? However that function can non be changed. In this situation, how should I debug?

var something = returnfunc(); //returnfunc() return function type object
console.log(something);

[Function]

Upvotes: 3

Views: 317

Answers (3)

djfdev
djfdev

Reputation: 6037

I think you're asking how to identify the function returned by returnfunc. If you use an anonymous function, it is harder to debug because that function is not identified with a name:

function returnfunc () {
  return function () {
    return 'I am an anonymous function'
  }
}

var fn = returnfunc() // [Function]

But you can just give the function a name:

function returnfunc () {
  return function foo () {
    return 'I am a named function'
  }
}

var fn = returnfunc() // [Function: foo]

Upvotes: 0

Ilya Zinkevych
Ilya Zinkevych

Reputation: 51

Maybe you meant check type of object that has value of function: 

var something = returnfunc;
console.log(typeof something);

Upvotes: 0

Luan Nico
Luan Nico

Reputation: 5917

You can call toString in the function to get a string representation of the source code ;)

E.g.:

let fn = (a, b) => a + b; 
console.log(fn.toString())
// (a, b) => a + b

Upvotes: 2

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