javascript: assign object function return value to object property

Question

When I try to assign getUnit's return value to the inputUnit property, my script throws the error "this.getUnit is not a function". Can anyone help?

function ConvertHandler(initialString) {

  this.inputUnit = this.getUnit(initialString); // Error here
  this.inputNum = this.getNum(initialString);
  this.returnedUnit = this.getReturnUnit(this.inputUnit);
  this.returnedNum = this.convert();

  this.getNum = function(input) {
    return input.match(/((\d*\.?\d+)*(\/?)(\d*\.?\d+))/igm);
  };

  this.getUnit = function(input) {
    return input.match(/[A-Za-z]+$/i);
  };
}

var a = new ConvertHandler('4mi');
console.log(a.spellOutUnit());

Cat · Accepted Answer · 2021-04-21 02:42:26Z

1

It looks like you're trying to invoke the method before you've defined it.

The assignment succeeds if the order is reversed, as in this snippet:

function ConvertHandler(initialString) {
  this.getNum = function(input) {
    return input.match(/((\d*\.?\d+)*(\/?)(\d*\.?\d+))/igm);
  };
  this.getUnit = function(input) {
    return input.match(/[A-Za-z]+$/i);
  };
  this.inputUnit = this.getUnit(initialString);
  this.inputNum = this.getNum(initialString);
}

var a = new ConvertHandler('4mi');
console.log(a.inputNum);
console.log(a.inputUnit)

answered Apr 21, 2021 at 2:42

Cat

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1 Comment

SamThYO Over a year ago

as an explanation: I thought I was having a misunderstanding in js oop, but in fact, this relates to func hoisting, if I did declare the functions, as "function getUnit (...){....}" it would have worked I guess because of the hoisting func, but I won't be able to access the function as an object property.

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