Sorting Array based on another array JavaScript

Suppose, we have two arrays like these −

const input = ['S-1','S-2','S-3','S-4','S-5','S-6','S-7','S-8'];
const sortingArray = ["S-1", "S-5", "S-2", "S-6", "S-3", "S-7", "S-4", "S-8"];

We are required to write a JavaScript function that takes in two such arrays as first and second argument respectively.

The function should sort the elements of the first array according to their position in the second array.

The code for this will be −

Example

const input = ['S-1','S-2','S-3','S-4','S-5','S-6','S-7','S-8'];
const sortingArray = ["S-1", "S-5", "S-2", "S-6", "S-3", "S-7", "S-4", "S-8"];
const sortByReference = (arr1 = [], arr2 = []) => {
   const sorter = (a, b) => {
      const firstIndex = arr2.indexOf(a);
      const secondIndex = arr2.indexOf(b);
      return firstIndex - secondIndex;
   };
   arr1.sort(sorter);
};
sortByReference(input, sortingArray); console.log(input);

Output

And the output in the console will be −

[
'S-1',
'S-5',
'S-2',
'S-6',
'S-3',
'S-7',
'S-4',
'S-8'
]

AmitDiwan

Published on 21-Nov-2020 10:13:22