How to convert array to object in JavaScript

Let’s say we need to convert the following array of array into array of objects with keys as English alphabet

const data = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]];

This can be done by mapping over the actual arrays and reducing the subarrays into objects like the below example −

Example

const data = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]];
const dataArr = data.map(arr => {
return arr.reduce((acc, cur, index) => ({
   ...acc,
      [String.fromCharCode(97 + index)]: cur
   }), Object.create({}))
});
console.log(dataArr);

Output

The console output for this code will be −

[
   { a: 1, b: 2, c: 3, d: 4 },
   { a: 5, b: 6, c: 7, d: 8 },
   { a: 9, b: 10, c: 11, d: 12 }
]