Get values from inside a nested function using this

Question

I have a piece of code which has two nested functions inside a main one.

How do I retrieve the nested functions using this keyword? Is it possible?

I have tried times().present() and new times().present() , none of them seem to work and return undefined.

I have found similar examples on w3School but cant seem to implement it in this case.

Thanks in advance.

function times() {
  var timingObj = function() {
    this.present = currentTime;
    this.past = pastTime;
  };

  var currentTime = function() {
    var hourMin = new Date().getHours() + ":" + new Date().getMinutes();
    return hourMin;
  };

  var pastTime = function() {
    if (new Date().getDay() == 5) {
      return "07:40"
    } else {
      return "16:30"
    }
  };
  return timingObj;
}

console.log(times().present());
//console.log(new times().present());

@BrandonDyer am new to using objects. but I will look up class now — Lala
– Lala, Commented Mar 29, 2019 at 12:11
You want to use the new operator on the function returned by times. Not on times itself. — adiga
– adiga, Commented Mar 29, 2019 at 12:22

Nicolae Maties · Accepted Answer · 2019-03-29 12:10:42Z

3

function times() {
  var currentTime = function() {
    var hourMin = new Date().getHours() + ":" + new Date().getMinutes();
    return hourMin;
  };

  var pastTime = function() {
    if (new Date().getDay() == 5) {
      return "07:40"
    } else {
      return "16:30"
    }
  };
  
  return {
    present: currentTime,
    past: pastTime
  };
}

console.log(times().present())

answered Mar 29, 2019 at 12:10

Nicolae Maties

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Comments

O.O · Accepted Answer · 2019-03-29 12:17:32Z

You can use Method call().

function times() {
  var timingObj = function() {
    this.present = currentTime;
    this.past = pastTime;
  };

  var currentTime = function() {
    var hourMin = new Date().getHours() + ":" + new Date().getMinutes();
    return hourMin;
  };

  var pastTime = function() {
    if (new Date().getDay() == 5) {
      return "07:40"
    } else {
      return "16:30"
    }
  };
  return timingObj;
}

times().call(null);
console.log(present(), past());

OR define them as prototype

function times() {
  var timingObj = function() {
    this.present = timingObj.prototype.currentTime;
    this.past = timingObj.prototype.pastTime;
  };

  timingObj.prototype.currentTime = function() {
    return new Date().getHours() + ":" + new Date().getMinutes();
  };

  timingObj.prototype.pastTime = function() {
    return new Date().getDay() === 5 ? "07:40" : "16:30";
  };

  return timingObj;
}

console.log(times().prototype.currentTime(), times().prototype.pastTime());

//times().call(null);
//console.log(present(), past());

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