JSFiddle - React, Tailwind, and code Playground

by temakashin

JavaScript

var size = prompt('Число?','')
    string = '',
    change = true;

for (var i = 1; i <= size * size; i++) {
    if (change && size%2 === 0) {
        if (i%2 === 0)
            string = string + '#';
        else
            string = string + ' ';
        if (i%size === 0) {
            change = !change;
            string = string + '\n';
        }
    } else {
        if (i%2 !== 0)
            string = string + '#';
        else
            string = string + ' ';
        if (i%size === 0) {
            change = !change;
            string = string + '\n';
        }
    }
}
console.log(string);