public/subjects/index-of.en.md

Index Of

Instructions

Create 3 functions:

• indexOf that return the index of the first occurence of a value
• lastIndexOf that return the index of the last occurence of a value
• includes that return true if the value was found in the array

If a value is not found, the returned index is -1

functions should have array element as first argument indexOf and lastIndexOf takes an additionnal fromIndex argument that allow you to begin searching from a specific index.

Notions

• https://devdocs.io/javascript/global_objects/array/indexof
• https://devdocs.io/javascript/global_objects/array/lastindexof
• https://devdocs.io/javascript/global_objects/array/includes

Code provided

all code provided will be added to your solution and doesn't need to be submited.

Array.prototype.indexOf = undefined
Array.prototype.lastIndexOf = undefined
Array.prototype.includes = undefined