Challenge: Find First Unique Integer in an Array

Given an array, find the first integer, which is unique in the array. Unique means the number does not repeat and appears only once in the whole array. Implement your solution in JavaScript and see if it runs correctly!

Problem Statement #

Implement a function, findFirstUnique(arr), which takes an array as input and returns the first unique integer in the array.

Note: The function should return null if no unique number is found.

Input #

An array of integers

Output #

The first unique element in the array

Sample Input #


Sample Output #


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