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javascriptobject-literal

reference variable in object literal?

say I have

myfunc({
  var1: 1,
  var2: 2,
})

if i want to have a value that makes use of the current unnamed object, how would I do this?

eg if I wanted

myfunc({
  var1: 1,
  var2: 2,
  var3: this.var1 + this.var2
})

obviously this does not work.

What would the correct syntax be?

Solution

  • Unfortunately, that isn't possible. While an object literal is being constructed, no external reference to that object exists until the entire literal is evaluated. The only way to use this at this stage is to use a constructor instead:

    function MyObject() {
  this.var1 = 1;
  this.var2 = 2;
  this.var3 = this.var1 + this.var2;
}

myfunc(new MyObject());