Find and show duplicated value

Question

Any idea how to get this:

var MyArr = [0,1,2,3,"something",44,661,3,1,"something"]
var Results = [1,3,"something"]

I just want to find duplicated values in my array.

Answer 1

Use a for loop:

var Results = [];
MyArr.forEach(function(el, idx){
    //check if value is duplicated
    var duplicated = MyArr.indexOf(el, idx + 1) > 0;
    if(duplicated && Results.indexOf(el) < 0) {
        //duplicated and not in array
        Results.push(el);
    }
});