how to use javascript Object.defineProperty

Question

I looked around for how to use the Object.defineProperty method, but couldn\'t find anything decent.

Someone gave me this snippet of code:

Object.def         


        

Answer 1

Object.defineProperty(Array.prototype, "last", {
  get: function() {
    if (this[this.length -1] == undefined) { return [] }
    else { return this[this.length -1] }
  }
});

console.log([1,2,3,4].last) //returns 4