how to go through an array and add their values

Question

I was wondering how is it possible to go through the values of an array and add their values together.

var arr = [1,2,3,4];

should I use

var add = $.each(arr,function() {


});

but how can I add the values together.

thanks

Answer 1

var total = 0;
$.each(arr,function() {
    total += this;
});

Answer 2

var arr = [1,2,3,4];
var total=0;
for(var i in arr) { total += arr[i]; }

Answer 3

Depending on how often you're going to need this, you might be better to create your own function to do it.

Iterating through large arrays using the jQuery $.each method might be expensive, performance-wise. You might be better to try:

Array.prototype.Sum = function() {
  return (! this.length) ? 0 : this.slice(1).sum() +
      ((typeof this[0] == 'number') ? this[0] : 0);
};

And then you can call

var mySum = arr.Sum();

Answer 4

I would just loop through the elements and add them up.

However, jquery.arrayUtils.js looks interesting.

Answer 5

var arr=[1,2,3,4];
alert(eval(arr.join('+')));