Question

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Counting occurences of Javascript array elements

I have an array in javascript and for example the array is:

array(1,1,1,1,5,5,7,7);

If can some one please help me to understand how to count similar values,
And how to join similar values,
Thank you all and have a nice day.

Answer 1

If you’re looking to uniquely identify array contents:

Array.prototype.unique =
  function() {
    var a = [];
    var l = this.length;
    for(var i=0; i<l; i++) {
      for(var j=i+1; j<l; j++) {
        // If this[i] is found later in the array
        if (this[i] === this[j])
          j = ++i;
      }
      a.push(this[i]);
    }
    return a;
  };

  var myArray = [1,1,1,1,5,5,7,7];

  var uniquedMyArray = myArray.unique();
  var valueCountsMyArray = [];
  for (var i = 0; i < myArray.length; i++) {
     if (valueCountsMyArray[myArray[i]])
        valueCountsMyArray[myArray[i]]++;
     else
        valueCountsMyArray[myArray[i]] = 1;
  }