Find duplicate

Given an array of n integers with duplicate, output unique numbers of the array.

Hint

Create an empty list to store the unique items. Go through each item in the original list, and check if the item is already in the unique items list. If it's not, add it to the unique items list. Return the unique items list.

Python
Javascript

# Python implementation

ls = [1, 2, 3, 3, 5, 7, 7, 8, 1]
output = []

for item in ls:
  if item not in output:
    output.append(item)

print(output)

// Javascript implementation

const list = [1, 2, 3, 3, 5, 7, 7, 8, 1];
const output = [];

for (let item of list) {
  if (!output.includes(item)) {
    output.push(item);
  }
}

console.log(output);