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lpdevslpdevs
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‎program_structure_chess_board_3_1.js

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for (var row = 0; row < 8; row++) {
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var str = '';
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for (var col = 0; col < 8; col++) {
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if ((row % 2) == (col % 2)) {
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str += '#';
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} else {
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str += '_';
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}
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}
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console.log(str);
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}

‎program_structure_chess_board_3_2.js

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while(true) {
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var number = Number(prompt("Enter a positive number:"));
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if(!isNaN(number) && number > 0) break;
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}
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for (var row = 0; row < number; row++) {
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var str = '';
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for (var col = 0; col < number; col++) {
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if ((row % 2) == (col % 2)) {
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str += '#';
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} else {
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str += '_';
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}
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}
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console.log(str);
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}

‎program_structure_prime_4.js

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while (true) {
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var number = Number(prompt('Enter a positive number:'));
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if (!isNaN(number) && number > 0) break;
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}
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if (number < 2) {
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alert("It's not a prime number.");
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}
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else if(number == 2) {
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alert("It's a prime number.");
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}
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else {
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var check = true;
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for(var i = 2; i < number; i++) {
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if (number % i == 0) {
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check = false;
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break;
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}
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}
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if(check) alert("It's a prime number.");
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else alert("It's not a prime number.");
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}

‎program_structure_prompt_2.js

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while (true) {
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var number = Number(prompt("Enter a number:"));
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if (isNaN(number)) {
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alert("It's not a number.");
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} else if (number < 10){
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alert("It's too small.");
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} else {
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break;
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}
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}

‎program_structure_triangle_1.js

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var row = '';
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for(var i = 1; i <= 7; i++){
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row += '#';
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console.log(row);
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}

‎test.html

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<!DOCTYPE html>
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<html>
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<head>
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<script>
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// JavaScript code here...
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while (true) {
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var number = Number(prompt('Enter a positive number:'));
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if (!isNaN(number) && number > 0) break;
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}
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if (number < 2) {
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alert("It's not a prime number.");
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}
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else if(number == 2) {
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alert("It's a prime number.");
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}
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else {
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var check = true;
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for(var i = 2; i < number; i++) {
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if (number % i == 0) {
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check = false;
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break;
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}
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}
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if(check) alert("It's a prime number.");
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else alert("It's not a prime number.");
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}
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</script>
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</head>
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<body></body>
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</html>

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