Question 217950 in Javascript Question posted in
A very good W3school tutorial can be found here.

JavaScript Object Literal – how to replace `this` keyword for another thing

Is there any way to avoid the constant use of the this keyword to access the properties and methods of the current object?

I tried something like in Example 2, but it doesn’t work at all.

Example 1:

<script>

  var fruits = {

    printApple(){ return "Apple"; },

    printBanana(){ return "Banana"; },

    printPear(){ return "Pear"; },

    printAll(){ return "All Fruits: " + this.printApple() + ", " + this.printBanana() + ", " + this.printPear(); }

  }

  alert(fruits.printAll());

</script>

Example 2:
(this script doesn’t work, don’t use it)

<script>

  var fruits = {

    y(){ return this.fruits; },

    printApple(){ return "Apple"; },

    printBanana(){ return "Banana"; },

    printPear(){ return "Pear"; },

    printAll(){ return "All Fruits: " + y.printApple() + ", " + y.printBanana() + ", " + y.printPear(); }

  }

  alert(fruits.printAll());

</script>
Tags:

2

Answers


  1. 0

    The use of this like many languages is unavoidable. especially when you need to access properties or methods of the same object.

    this keyword is special variable that every execution context gets and it automatically set by the JS engine.

    Your example 2 – the script does not work because y is not defined in the global context.

          var fruits = {
    
        printApple(){ return "Apple"; },
    
        printBanana(){ return "Banana"; },
    
        printPear(){ return "Pear"; },
    
        printAll(){
          var self = this;
          return "All Fruits: " + self.printApple() + ", " + self.printBanana() + ", " + self.printPear(); 
        }
      }
    
      alert(fruits.printAll());
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  2. 0

    Basically, "NO". You do need to reference some object and then run the method on it.

    "this is a question, for the example 2 how can i avoid the constant use of the this keyword, and replace for something more shortable. Or simply do not use."

    you could use an optional parameter, defaulting to this as below:

    var fruits = {

  printApple() {
    return "Apple";
  },

  printBanana() {
    return "Banana";
  },

  printPear() {
    return "Pear";
  },

  printAll(o = this) {
    return "All Fruits: " + o.printApple() + ", " + o.printBanana() + ", " + o.printPear();
  }
}

alert(fruits.printAll());
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