Posts made by Poelie

I am writing a .sort function that sorts an array of objects by one of their properties. See the snippet below. 

PriorityQueue.prototype.sort = function () {
 var criterium = this.criteria; // For some reason using this.criteria in the next line doesn't work.
 this.queue.sort(function(a,b) {
 return b[criterium] - a[criterium]
 });
}

This works, but I'm curious why I have to define the variable criterium. If I were to use this.criteria within the sort function (i.e. "return b[this.criteria] - a[this.criteria]) then they return 'undefined'. For example, see the below code 

PriorityQueue.prototype.sort = function () {
 var criterium = this.criteria;
 this.queue.sort(function(a,b) {
 return console.log(a[criterium] + '___' + a[this.criteria]) // 10___undefined 
 });
}

Here, a[criterium] correctly returns its associated number (10) whereas a[this.criteria] returns undefined. This happens despite that criterium = this.criteria. 

Does anyone know why I can't use this.criteria within the sort function?