What do you prefer: defining properties with the JSON object or with objectName.property in JavaScript

Can you tell me which approach is considered the best practice?

Is it better to use the "this" statement in the following way:

var obj = {
  x: 20,
  y: 10,
  width: this.x,
  height: this.y,
  render: function () { // renders object on canvas
    ctx.fillRect(this.x, this.y, this.width, this.height);
  }
};

Or should I refer to the object by its name like this:

var obj = {
  x: 20,
  y: 10,
  width: obj.x,
  height: obj.y,
  render: function () { // renders object on canvas
    ctx.fillRect(obj.x, obj.y, obj.width, obj.height);
  }
};

Thanks a lot for your help!

Answer №1

Neither of these situations will be effective for your needs.

var obj = {
  x: 20,
  y: 10,
  width: this.x,
  height: this.y,
  render: function () {  //renders object on canvas
    ctx.fillRect(this.x, this.y, this.width, this.height);
  }
};

In the first case, using width: this.x and height: this.y will not work as expected. This is because the 'this' keyword within the object only refers to inside the render function. Outside of that function, 'this' refers to the window object.

var obj = {
  x: 20,
  y: 10,
  width: obj.x,
  height: obj.y,
  render: function () {  //renders object on canvas
    ctx.fillRect(obj.x, obj.y, obj.width, obj.height);
  }
};

In the second scenario, attempting to use width: obj.x and height: obj.y may result in errors since you are trying to access the object variable in the middle of its declaration. However, there should be no issues when used within the render function.

Answer №2

Opt for the initial option as it provides a clearer indication to fellow developers regarding your reference.

This particular choice was designed for the task at hand, utilizing it ensures that your intentions are clearly communicated without any ambiguity.

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