Map, Filter and Reduce Operators in JavaScript

Today we will provide you an understanding of the Map, Filter and Reduce Operators in JavaScript. These three operators are very useful in JS development.

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In Order to understand, let’s start with an example. Consider the below variable with default value.

Understanding of the Map, Filter and Reduce Operators

  1. Map Operator
  2. Filter Operator
  3. Reduce Operator

1. Map Operator

If I already have an array and I want to do the exact same operation on each of the elements in the array and return the same amount of items in the array, use the map.

In the above example we will have an array of product names.

2. Filter Operator

If I already have an array but I only want to have items in the array that match certain criteria, use the filter.

3 Reduce Operator

If I already have an array, but I want to use the values in that array to create something completely new, use the reduce.

NOTE: If you are not define the initial value then by default it will consider the first element of an array as a initial value.

That’s it for today.

Thank you for reading. Happy Coding!

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