Group Array Elements Based on Function

Introduction

In this lab, we will explore how to group elements of arrays based on their position and combine them using a function. We will use the zipWith function to achieve this, which creates an array of elements that are grouped based on their position in the original arrays. The zipWith function can be very useful when working with arrays of different lengths and we will see how to use it to handle such scenarios.

Skills Graph

JavaScript Function to Group Array Elements

To group elements in arrays, you can use the zipWith function.

Here's how it works:

• The function takes an unlimited number of arrays as arguments.
• It checks if the last argument is a function.
• It uses Math.max() to find the length of the longest array.
• It creates a new array of grouped elements using Array.from() and a mapping function.
• If the lengths of the argument arrays vary, undefined is used where no value could be found.
• The function is invoked with the elements of each group.

Here's an example usage of the zipWith function:

zipWith([1, 2], [10, 20], [100, 200], (a, b, c) => a + b + c); // [111, 222]
zipWith(
  [1, 2, 3],
  [10, 20],
  [100, 200],
  (a, b, c) =>
    (a != null ? a : "a") + (b != null ? b : "b") + (c != null ? c : "c")
); // [111, 222, '3bc']

To use the zipWith function, open the Terminal/SSH and type node.

Summary

Congratulations! You have completed the Group Array Elements Based on Function lab. You can practice more labs in LabEx to improve your skills.