• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
JavaScriptSource

JavaScriptSource

Search 5,000+ Free JavaScript Snippets

  • Home
  • Forum
  • Browse Snippets
    • Addon
    • Ajax
    • Buttons
    • Cookies
    • CSS
    • Featured
    • Forms
    • Games
    • Generators
    • Image Effects
    • Math Related
    • Miscellaneous
    • Multimedia
    • Navigation
    • Page Details
    • Passwords
    • Text Effects
    • Time & Date
    • User Details
Home / Miscellaneous / Check if array has duplicates

Check if array has duplicates

Check if array has duplicates

Checks if there are duplicate values in a flat array. Use Set to get the unique values in the array. Use Set.prototype.size and Array.prototype.length to check if the count of the unique values is the same as elements in the original array.

const hasDuplicates = arr => new Set(arr).size !== arr.length;

// EXAMPLES
hasDuplicates([0, 1, 1, 2]); // true
hasDuplicates([0, 1, 2, 3]); // false

Source

https://www.30secondsofcode.org/js/s/has-duplicates

Miscellaneous

Related Snippets:

  • Copy text to the clipboard
  • Remove whitespaces from a string
  • Add items to an array in JavaScript
  • Get Siblings of an Element

Primary Sidebar

FREE UPDATES!

Get the latest updates in your inbox for FREE!

Popular Posts

Story Generator

IP Grabber

Simple Calendar

Remove Ads

Astrological Calculator

Copyright © 2022 JavaScriptSource.com

  • About
  • Privacy Policy
  • Submit
  • FAQ
  • Jobs For Developers
  • Contact Us