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Returns true if an array has duplicate elements or a string has duplicate characters.
Downloads
11,225
A Node.js module that checks an array for duplicate elements or a string for duplicate characters.
npm install has-duplicates --saveconst hasDuplicates = require('has-duplicates')
// Arrays
hasDuplicates([1, 1]) // true
hasDuplicates([1, 2]) // false
// Strings
hasDuplicates('aa') // true
hasDuplicates('ab') // false