has-duplicates

has-duplicates

A Node.js module that checks an array for duplicate elements or a string for duplicate characters.

Installation

npm install has-duplicates --save

Usage

const hasDuplicates = require('has-duplicates')

// Arrays
hasDuplicates([1, 1]) // true
hasDuplicates([1, 2]) // false

// Strings
hasDuplicates('aa') // true
hasDuplicates('ab') // false