Create an object from the pairs of key and value

JavaScript

const toObj = (arr) => Object.fromEntries(arr)

// Or
const toObj = (arr) => arr.reduce((a, c) => ((a[c[0]] = c[1]), a), {})

Examples

toObj([
  ['a', 1],
  ['b', 2],
  ['c', 3],
]) // { a: 1, b: 2, c: 3 }