Merge multiple two-dimensional arrays into one two-dimesional array in javascript

Question

How do you combine these arrays into one merged array? The data is from a table with rows and columns.

One array contains data of an entire single column.

I would like to merge these columns into one array with 3 columns.

//array from col 1
let firstArray = [
    [100],      //row 1, col 1
    [200],      //row 2, col 1
    [300]       //row 3, col 1
]

//array from col 2
let secondArray = let firstArray = [
    ['a'],      //row 1, col 2
    ['b'],      //row 2, col 2
    ['c']       //row 3, col 2
]

//array from col 2
let secondArray = let firstArray = [
    ['run'],        //row 1, col 3
    ['hide'],       //row 2, col 3
    ['seek']        //row 3, col 3
]

Expected merged array output:

let mergedArray = [
    [100, 'a', 'run'],      //row 1, col 123
    [200, 'b', 'hide'],     //row 2, col 123
    [300, 'b', 'seek']      //row 3, col 123
]

Answer 1

const firstArray = [
    [100],      //row 1, col 1
    [200],      //row 2, col 1
    [300]       //row 3, col 1
];
const secondArray = [
    ['a'],      //row 1, col 2
    ['b'],      //row 2, col 2
    ['c']       //row 3, col 2
];
const thirdArray = [
    ['run'],        //row 1, col 3
    ['hide'],       //row 2, col 3
    ['seek']        //row 3, col 3
];

const mergedArray = firstArray.map((item1, i) => {
  const item2 = secondArray[i];
  const item3 = thirdArray[i];
  return [item1[0], item2[0], item3[0]];
});
console.log(mergedArray);