push only unique elements in an array

Question

I have array object(x) that stores json (key,value) objects. I need to make sure that x only takes json object with unique key. Below, example \'id\' is the key, so i don\'t

Answer 1

This is how I would do it in pure javascript.

var x = [{"id":"item1","val":"Items"},{"id":"item1","val":"Items"},{"id":"item1","val":"Items"}];

function unique(arr, comparator) {
  var uniqueArr = [];
  for (var i in arr) {
    var found = false;
    for (var j in uniqueArr) {
      if (comparator instanceof Function) {
        if (comparator.call(null, arr[i], uniqueArr[j])) {
          found = true;
          break;
        }
      } else {
        if (arr[i] == uniqueArr[j]) {
          found = true;
          break;
        }
      }
    }
    if (!found) {
      uniqueArr.push(arr[i]);
    }
  }
  return uniqueArr;
};

u = unique(x, function(a,b){ return a.id == b.id; });
console.log(u);

y = [ 1,1,2,3,4,5,5,6,1];
console.log(unique(y));