is-array-uniq 
Check if all the items in an array are unique.
Install
npm install is-array-uniq
Usage
const isArrayUniq = require("is-array-uniq");
isArrayUniq([1, 2]);
//=> true
isArrayUniq([1, 1]);
//=> false
API
isArrayUniq(array)
array
Type: array
The array to check.