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How can I debug a variable of type [Function]?

Some functions are defined in variables. And I want to debug what function is installed there? However, this function cannot be changed. In this situation, how should I debug?

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

[Function]
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3 answers


You can call toString

in a function to get a string representation of the source code;)

eg:.



let fn = (a, b) => a + b; 
console.log(fn.toString())
// (a, b) => a + b
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Perhaps you meant the type of object validation that has a function value:



var something = returnfunc;
console.log(typeof something);
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I think you are asking how to define the function to return returnfunc

. If you are using an anonymous function, it is harder to debug because the function is not identified by 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]
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