Sort the second array according to the elements of the first array in JavaScript

Suppose, we have two arrays like these −

const arr1 = ['d','a','b','c'] ;
const arr2 = [{a:1},{c:3},{d:4},{b:2}];

We are required to write a JavaScript function that accepts these two arrays. The function should sort the second array according to the elements of the first array.

We have to sort the keys of the second array according to the elements of the first array.

Therefore, the output should look like −

const output = [{d:4},{a:1},{b:2},{c:3}];

Therefore, let’s write the code for this function −

Example

The code for this will be −

const arr1 = ['d','a','b','c'] ;
const arr2 = [{a:1},{c:3},{d:4},{b:2}];
const sortArray = (arr1, arr2) => {
   arr2.sort((a, b) => {
      const aKey = Object.keys(a)[0];
      const bKey = Object.keys(b)[0];
      return arr1.indexOf(aKey) - arr1.indexOf(bKey);
   });
};
sortArray(arr1, arr2);
console.log(arr2);

Output

The output in the console will be −

[ { d: 4 }, { a: 1 }, { b: 2 }, { c: 3 } ]

AmitDiwan

Updated on 21-Oct-2020 12:04:17

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