Question

How can I count the array depending on the value..
I have an array with this value..

var myArr = new Array(3);
myArr[0] = "a";
myArr[1] = "a";
myArr[2] = "b";

I need to count the array depending on the value

Array with Value A is 2
Array with value B is 1

Thanks!

Answer 1

var myArr = new Array(3);
myArr[0] = "a";
myArr[1] = "a";
myArr[2] = "b";


function count(array, value) {
  var counter = 0;
  for(var i=0;i<array.length;i++) {
    if (array[i] === value) counter++;
  }
  return counter;
}

var result = count(myArr, "a");
alert(result);

If you’re interested in a built-in function… you could always add your own.

Array.prototype.count = function(value) {
  var counter = 0;
  for(var i=0;i<this.length;i++) {
    if (this[i] === value) counter++;
  }
  return counter;
};

Then you could use it like this.

var result = myArr.count("a");
alert(result);