Javascript getter function from within function

Question

I am trying to create my object through a function, but I am unable to figure out the syntax for the getter function.

var myObject = 
{
  0:123,

  get a()
  {
        return this[0];
  }
}


console.log("This works: " + myObject.a);


function test()
{
    this[0] = 123;

// error
    this.a = get function()
  {
  return this[0];
  };
}


var myTest = new test();

console.log(myTest.a);

Within the test function, the assignment of the get function throws a missing semicolon error and if I remove the keyword "function", it says that get is not defined.

How can I assign a getter function to the current object within my function?

I don't think the var f = get function(){...} syntax is correct, use var f=get {...} instead. Your function test fails to parse, while removing the function() makes it work — Aaron
– Aaron, Commented Feb 2, 2017 at 14:31
You get that error as that is not the correct syntax to use for defining a getter — Patrick Evans
– Patrick Evans, Commented Feb 2, 2017 at 14:34

Darin Cardin · Accepted Answer · 2017-02-02 14:35:58Z

2

You could try something like this:

var myObject = 
{
  0:123,

  get a()
  {
        return this[0];
  }
}


console.log("This works: " + myObject.a);


function test()
{
    this[0] = 123;

    Object.defineProperties(this, {"a": { get: function () { 
        return this[0]; 
    }}});   
}


var myTest = new test();

console.log(myTest.a);

answered Feb 2, 2017 at 14:35

Darin Cardin

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2 Comments

John Over a year ago

Is there a shorthand version similar to what I was attempting to do or is this the only way?

Darin Cardin Over a year ago

I do not think so. You can only use the short way with an object literal. This is as close as i can get, and in this case, you are not passing back 'this'. function test() { return { "0":123, get a() { return this["0"]; } } }

slou · Accepted Answer · 2017-02-02 14:46:38Z

0

Maybe this will work for you :

      function test()
      {
          this[0] = 123;

          Object.defineProperty(this, "a", { get: function () { return this[0]; } });
      }

answered Feb 2, 2017 at 14:46

slou

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