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787 B

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

indexOf and lastIndexOf takes an additionnal fromIndex argument that allow you to begin searching from a specific index.

Notions

Code provided

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