check if obj exists in array then add if not

if(array.indexOf(someObj) === -1) {add} else {next}

var source = [{name: "Fitsum", race: "blk"},{name: "Alice", race: "wht"},{name: "Jen", race: "wht"},{name: "Kim", race: "blk"},{name: "Lee", race: "asn"}],
	target = [];

function userExists(name, idx, oldArr) {
  return target.some(function(el) {
    return el.name === name;
  }); 
}

function addUser(name, idx, newArr) {
  if (userExists(name, idx, source)) {
  	console.log(name,"already exists in", newArr);
    return false; 
  }
  target.push(source[idx]);
  return true;
}

for(var i = 0; i < source.length; i++){	
	addUser(source[i].name, i, target);
}
console.log(target);