JS: unique array

index.js

// O(n^2): loop in loop
function unique_one (array) {
  var result = [];

  for (var i = 0; i < array.length; i++) {
    for (var j = i; j < array.length; j++) {
      if (array[i] == array[j]) {
        // mmmm
      }
    } 
    result.push(array[i])
  }

  return result;  
}

// O(n): loop + hash
function unique_two () {
  var result = [];

  return result;
}

// test
var assert = require('assert');

var data = [
  { should:[0, 1, 1, 2], toBe: [0, 1, 2] },
  { should:[2, 1, 0, 0], toBe: [2, 1, 0] },
  { should:[1, 1, 1], toBe: [1] },
  { should:[0], toBe: [0] }
];

console.log('unique_one');

data.forEach(function (it) {
  var should = unique_one(it.should); 
  assert.deepEqual(
    should, it.toBe,
    should + ' should equal ' + it.toBe
  );
});

console.log('unique_two');

data.forEach(function (it) {
  var should = unique_two(it.should); 
  assert.deepEqual(
    should, it.toBe,
    should + ' should equal ' + it.toBe
  );
});

console.log('all passed');