Canva Frontend Developer interview questions

Initial Meeting with Recruiter: They asked several JS questions: 1. What is the diff between var , let and const modifiers? 2. In JS what happens if you call setTimeout with delay of 0? will the call back function be executed immediately, like right at the setTimeout call? 3. If you have 1000 HTTP request that you need to send from a single client to a single backend service as quickly as possible, how do you do it and what problems you will encounter? 4. Tell me what this code is doing: function (a, b) { return a % b === 0 } 5. Same thing: function (arr) { return new Set(arr).size; } 5. Same thing: function (paragraph) { return Math.max(...paragraph.split(' ').map(s => s.length) } 6. same thing: function (arr) { const m = new Map(); for (let i = 0 ; i < arr.length; i++) { let num = m.get(arr[i]) || 0; m.set(arr[i], num + 1); } return m; } Input: [1,1,5,6], what do you expect to be thrown out of this function? 7. same thing: function (promises) { let arr = []; let fn; promises.forEach(p => { p.then(v => { arr.push(v); arr.length === 10 && fn(arr; }) }) return new Promise(r => fn = r) } First Coding Interview: make a Sudoku game using HTML, CSS, Vanilla JS