Question

Write a function that finds the first non-repeating element in an array?
function solve( a, b ){ //write your code here }
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Finds the first number in the array that doesn't repeat anywhere else

input:[4, 5, 1, 2, 0, 4, 5, 2]
output:1

input:[7, 3, 5, 3, 5, 7, 9]
output:9