Remove duplicates in JavaScript

removeDuplicates one-liner

const removeDuplicates = (array) => [...new Set(array)];

Summary

• Set is a built-in JavaScript object that only stores unique values. When you pass an array to new Set(array), all duplicate values are automatically removed.
• The spread operator [...set] converts the Set back into a regular array, giving you a clean, duplicate-free result.
• This is a concise one-liner that handles primitive values (numbers, strings, booleans) effectively. For objects or arrays as elements, you would need a custom comparison since Set checks by reference.