JAVASCRIPT

two array in one js

let arr1 = ["item1", "item2", "item3"]
let arr2 = ["item4", "item5", "item6"]

let arr3 = arr1.concat(arr2) //[ 'item1', 'item2', 'item3', 'item4', 'item5', 'item6' ]

from array create two arrayjavascript

//If you find something better, please, let me know :(
let arr = [[1,2],[3,4],[5,6]]
let [arr1, arr2] = [[], []]
arr.map((e) => { arr1.push(e[0]); arr2.push(e[1]) })
console.log(arr1,arr2) // [[1,3,5],[2,4,6]]