Question 236780 in Javascript Question posted in
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How to convert two 1d array to one 2d array to apply Object.fromEntries in Javascript

I had two array:

const keys = [a, b, c]
const values = [[], [], []]

I want to convert it to a 2d array:

const entries = [[a, []], [b, []], [c, []]]

How can I do it?

P.S. Actually I want to apply Object.fromEntries to initialise an object in the end.

const x = {a: [], b: [], c: []}
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3

Answers


  1. 0

    You can use an Array.map for example

    const keys = ["a", "b", "c"]
const values = [[], [], []]

const entries = keys.map((key, i) => [key, values[i]]);

const obj = Object.fromEntries(entries)
console.log(obj)

    or forEach

    const keys = ["a", "b", "c"]
const values = [[], [], []]

const obj = {}
keys.forEach((key,i) => obj[key] = values[i])

console.log(obj)

    or a reduce

    const keys = ["a", "b", "c"]
const values = [[], [], []]


const obj = keys.reduce((acc,cur,i) => (acc[cur] = values[i], acc),{})

console.log(obj)
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  2. 0

    const data = keys.map((key, index) => [key, values[index]]);

    you can use this data like this : Object.fromEntries(data)

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  3. 0

    You may consider Array.reduce, to make Object.fromEntries obsolete:

    const [a, b, c] = [`keyA`, `keyB`, `keyC`];
const values = [[], [], []];
const combined = [a, b, c].reduce((acc, val, i) => 
  ({...acc, [val]: values[i]}), {});
console.log(combined);
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