public/subjects/index-of

Index Of

Instructions

Create 3 functions:

• indexOf which returns the index of the first occurence of a value and takes as arguments an array to be searched, the value to be matched, and optionally the index from where to start searching from.
• lastIndexOf which works just like the previous function but returns the index of the last occurence of a value
• includes which returns true if the value was found in the array

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

functions should have an array element as first argument, both indexOf and lastIndexOf take an additional fromIndex argument that allows you to begin searching from a specific index.

Notions

• devdocs.io/javascript/global_objects/array/indexof
• devdocs.io/javascript/global_objects/array/lastindexof
• 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