Javascript exercises answered from http://eloquentjavascript.net/index.html

chapter2-1.js

// prints out a right triangle made out of hash tags
let output = "";
for (x = 1; x < 8; x = x + 1) {
    output += "#";
    console.log(output);
}

chapter2-2.js

// if divisible by 3, Fizz, if by 5, Buzz, if both FizzBuzz;
// otherwise just print the number
for (let i = 1; i < 101; i = i + 1) {
    output = "";
    if (i % 3 == 0) output = "Fizz";
    if (i % 5 == 0) output += "Buzz";
    if (output) console.log(output);
    else console.log(i);
}

chapter2-3.js

// draw a checkered board with given height and width
const board = function(height,width) {
    let square = "";
    let board = "";
    for(let h = 0; h < height; h = h + 1) {
        if (h%2) square="#"; else square=" ";
        line = "";
        for(let w = 0; w < width; w = w + 1) {
            line += square;
            if (square=="#") square=" "; else square="#";
        }
        line += '\n';
        board += line;
    }
    return board;
}

console.log(board(8,8));