How to convert two array into map in javascript

Question

I have two arrays that look like this:

array1 = ["org1", "org2", "org3"];
array2 = ["a", "b", "c"];

Using JavaScript, I want to convert two arrays of same length into array of objects that would look like this:

orgMSPID = [{"org1": "a"},{"org2": "b"}, {"org3": "c"}]

Please anybody suggest me how to convert it?

Answer 1

You can use Array.map() to iterate the array1 and use [] for the dynamic key of the object.

const array1 = ["org1", "org2", "org3"];
const array2 = ["a", "b", "c"];

const orgMPSID = array1.map((key, index) => ({ [key]: array2[index] }));

console.log(orgMPSID);

Answer 2

Zipping two (or more) arrays together is quite a common operation. If you use a library with helpers, chances are big that it includes a helper function for this (often named zip). If you aren't using a helper library consider adding a zip function yourself.

zip([1,2,3], [4,5,6]) //=> [[1,4], [2,5], [3,6]]

Each entry within this result can then easily be transformed into an object using any of the lines below:

entries.map(entry => Object.fromEntries(Array.of(pair)));
entries.map(entry => Object.fromEntries([entry]));
entries.map(([key, value]) => ({ [key]: value }));

const zip = (...args) => args[0].map((_, i) => args.map(arg => arg[i]));

const array1 = ["org1", "org2", "org3"];
const array2 = ["a", "b", "c"];

const result = zip(array1, array2).map(([key, value]) => ({ [key]: value }));

console.log(result);

Answer 3

let array1 = ["org1", "org2", "org3"];
let array2 = ["a", "b", "c"];
let array3 = [];

for(let i=0; i< array1.length; i++){
 let item = {};
 item[array1[i]]=array2[i];
 array3.push(item)
}

console.log(array3);

Answer 4

You can use Array.prototype.reduce().

You iterate through array1, and use the current index to reference array2 (or you could flip it the other way instead).

const array1 = ["org1", "org2", "org3"];
const array2 = ["a", "b", "c"];
const orgMSPID = array1.reduce((c, e, i) => {
  c.push({ [e] : array2[i] });
  return c;
}, []);
console.log(orgMSPID);