Find Index

Problem

Given an array of integers numbers and an integer target, return the index of target in numbers. If target is not present in the array, return -1.

Examples:

myFindIndex([1, 9, 5, 15], 5)
// 2
// numbers[2] = 5, so the target indice is 2.

myFindIndex([1, 9, 5, 15], 15) // 3
myFindIndex([1, 9, 5, 15], 4) // -1