Javascript Sort Array Based On Another Array

Sorting arrays in JavaScript is a common task, but what about sorting one array based on the order of another array? This can be super useful in situations where you have corresponding data in two arrays and need to sort one based on a specific order defined by the other. Fear not, for we'll guide you through this process step by step.

Let's say you have two arrays: `mainArray` which contains the items you want to sort, and `orderArray` which specifies the order in which the items in `mainArray` should appear after sorting. The goal is to sort `mainArray` based on the order specified in `orderArray`.

Here's a simple and efficient method to achieve this using JavaScript:

const mainArray = ['apple', 'orange', 'banana', 'pear'];
const orderArray = ['orange', 'apple', 'pear', 'banana'];

mainArray.sort((a, b) => {
    return orderArray.indexOf(a) - orderArray.indexOf(b);
});

console.log(mainArray);

In this code snippet, the `sort` method is called on the `mainArray`, while the sorting logic is contained within the comparator function `(a, b) => {...}` provided as an argument to the `sort` method. Inside this function, we use the `indexOf` method on `orderArray` to determine the position of elements `a` and `b` in the `orderArray`.

By subtracting the indices of `a` and `b`, we ensure that elements are sorted based on their order in `orderArray`. This comparison function tells JavaScript how to sort the elements in `mainArray`.

When you run this code, you'll find that `mainArray` has been sorted based on the desired order specified in `orderArray`.

It's important to note that this method assumes all elements in `mainArray` are present in `orderArray` and does not account for elements that may be missing. If an element in `mainArray` does not exist in `orderArray`, it will be placed after all the elements that do exist in `orderArray`.

By using this technique, you can easily sort one array based on the order defined in another array, providing you with a flexible and efficient way to organize your data structures in JavaScript.

So there you have it! Sorting arrays based on another array in JavaScript doesn't have to be complicated. With this approach, you can quickly achieve the desired sorting order and take your coding skills to the next level. Happy coding!