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1.3 KiB

Index Of

Instructions

Create 3 functions:

  • indexOf which returns the index of the first occurrence 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 occurrence 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 and it will work exactly like in the original methods.

Notions

Code provided

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

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