Chapter 2 Exercises

Javascript Programming
#1286
  1. It is a good practise to do your self. keep it up.
2 Likes
#1287

These exercises are taking me hours…no experience prior to November 9!. Same boat, I get the logic but the syntax and remembering what works/doesn’t is challenging. Check out this link I found. There’s a bunch of examples, fill in the blank type thing. It’s helped me a bit haha.

https://www.w3schools.com/js/js_exercises.asp

#1288

My fizzbuzz code was 10x the size and took me several hours haha. Just started learning Javascript this week. Your solutions make it look so easy!

#1289

FizzBuzz

for(var a = 1 ; a <=100 ; a++){
var output = “” ;
if(a % 3 == 0 && !(a % 5 == 0))output += “fizz” ;
if(a % 5 == 0 && !(a % 3 == 0))output += “buzz” ;
if(a % 3 == 0 && a % 5 ==0)output += “fizzbuzz” ;
console.log(output || a)
}

Triangle

var stars = “” ;
for(counter = 0 ; counter < 10 ; counter ++){
console.log(stars = stars + “*”);
}

Chessboard

var stars = “” ;
for(counter = 0 ; counter < 4 ; counter ++){
console.log("# # # # # # # # “) ;
console.log(” # # # # # # # #") ;
}

#1290

chessboard
chessboard1920×1034 120 KB
FIZZ BUZZ ELY
FIZZ BUZZ ELY1456×1028 88.2 KB
triangles
triangles1673×1040 72.2 KB

well i have to admit .it was no easy maybe because this exercises are my very first ones, no previous knowledge in coding i really hope to undersant better about it i think with more practice .

1 Like
#1291

// FIZZBUZZ
for(let n = 1; n <= 100; n++){
let output = “”;
if(n % 3 == 0) output += “Fizz”;
if(n % 5 == 0 && n % 3 != 0) output += “Buzz”;
console.log(output || n);
}

// CHESSBOARD
let size = 8;
let board = "";
for (y=0; y<size; y++){
  for (x=0; x<size; x++){
    if ((x+y) % 2 == 0){
    board += " ";
    }
    else {
      board += "#";
    }
    }
    board += "\n";
  }
  console.log(board)
2 Likes
#1292

FizzBuzz:

for (var num = 1; num <= 100; num++) {var result = “”;
if (num % 3 == 0) result += “Fizz”;
if (num % 5 == 0) result += “Buzz”;
console.log(result || num);}

Chessboard:

for (var fullchess = 0 ; fullchess < 4 ; fullchess++){
var line1 = " # # # #";
var line2 = "# # # # ";
console.log(line1)
console.log(line2)
}

#1293

I too was confused by this as I didn’t realise that the 14 I was seeing at the bottom was not the console logging as part of the loop but merely reflecting the value of number. I take it the arrow pointing left is the indicator for this being the case

image

1 Like
#1294

============================
Looping a Triangle

var printThat = “#”;
for(var row = 0; row < 7; row++){
console.log(printThat)
printThat += “#”;
}

============================
FizzBuzz

x = “Fizz”
y = “Buzz”
for(var num=1; num<101; num++) {
if (num % 3 === 0) {
console.log(x)
}
if (num % 5 === 0 && num % 3 > 0){
console.log(y)
}
if (num % 5 === 0 && num % 3 === 0){
console.log(x+y)
}
}

============================
Chessboard:

var x = “# # # # "
var y = " # # # #”
for(a=0;a<8;a++){
if (a===0||a===2||a===4||a===6){
console.log(x)
}
else if (a===1||a===3||a===5||a===7) {
console.log(y)
}
}

1 Like
#1295
Chapter Two Exercises 
//Question 1 - Looping a triangle version 1 (long)

  <script type="text/javascript">

    let hashes = "";
    for(var i = 0; i < 7; i++){
      hashes += "#";
      console.log(hashes);
    }

 </script>

//Question 1 - Looping a triangle version 2 (short)

 <script type="text/javascript">

    for(var i = "#"; i.length <= 7; i += "#"){
      console.log(i);
    }

  </script>

//Question 2 - FizzBuzz   

  <script type="text/javascript">

    for (var i = 1; i < 101; i++) {

      if (i % 3 == 0 && i % 5 == 0) {
        console.log("Fizzbuzz");
      } else if (i % 3 == 0) {
        console.log("Fizz");
      } else if (i % 5 == 0) {
        console.log("Buzz");
      }else {
        console.log(i);
      }
    }

</script>

//Question 3 - Chessboard version 1 (long)

  <script type="text/javascript">
    let a = parseInt(prompt("Please select the size of your Chessboard"));
    let row1 = "";
    let row2 = "";
    let string = "";

    for(var i = 1; i <= a ; i++){
      if (i % 2 == 0){
        row1 += " ";
        row2 += "#";
      } else {
        row1 += "#";
        row2 += " ";
        }
      }

    for (var i = 1; i <= a; i++) {
        if (i % 2 == 0) {
          string += row1 + '\n';
        } else {
          string += row2 + '\n';
        }
      }

    console.log(string);

   </script>


  //Question 3 - Chessboard version 2 (short)

    <script type="text/javascript">

      let size = parseInt(prompt("Please select the size of your Chessboard"));
      let boardString = "";

      for (x = 0; x<size; x++){
        for (y = 0; y<size; y++){
          if( (x+y) % 2 == 0){
            boardString += " ";
          } else {
            boardString += "#";
          }
        }
        boardString += "\n";
      }

      console.log(boardString);


    </script>
1 Like
#1296

Quite impressed here. I originally had if (number = %3){ but that was my only mistake.

for(var number = 0; number<=100; number++)

if (number %3 == 0){
console.log(“Fizz”);
}
else if (number %5 == 0){
console.log(“Buzz”);
}
else{
console.log(number);
}

1 Like
#1297

Triangle Loop:

var text = “#”;
var row = 0;
while(row < 7){
console.log(text);
text+= “#”;
row++;
}

FizzBuzz Loop:

var n = 1;
for ( let row = 0; row < 100; row++){
if(n % 3 == 0){
console.log(“Fizz”);}
if(n % 5 == 0){
console.log(“Buzz”);}
console.log(n);
n++;
}

Chessboard Loop:
var txt = “”;
var dim = 8;
for (let row = 0; row < dim; row++){
for (let col = 0; col < 8; col++){
if((row+col) % 2 == 0){txt += “:”;}
else {txt+= "P ";}
}txt += “\n”;
}console.log(txt);

1 Like
#1299 
//Triangle
var n = 7;
count = 0;
string = "";

while (count<n) {
  string = string + "#";
  console.log (string);
  count++;
}


//FIZZBUZZ
var n = 100;

for (count=1; count<=n; count++){
  if (((count % 3) == 0) && ((count % 5) == 0)){
    console.log ("FizzBuzz");
  }
  else if ((count % 3) == 0){
    console.log ("Fizz");
  }
    else if ((count % 5) == 0){
      console.log ("Buzz");
    }
      else{
        console.log (count);
      }
}


//CHESSBOARD
var size = 8;
var string = "";
var char = " ";
for (row=1; row<=size;row++){
  if (row%2==0){
    char = "";
  }
  else {
    char = "#";
  }
  for (col=1;col<=size;col++){
    if (char == '#'){
      char = ' ';
    }
    else {
      char = '#';
    }
    string = string + char;
  }
  string = string + '\n';
}
console.log (string);
1 Like
#1300

Hi, Quick question. I tried to write the star code shorter, and it doesn’t start from the first star. Why is that, I don’t understand the difference. They both have the sameprint+="*".
this is
The normal code:

var x=10
for(y=0;y<x;y++){
var print="";
for(z=0;z<y;z++){
print+=""}
console.log(print);}

and this is shortened:

var print="";
for(y=0;y<10;y++){
print+="";
console.log(print);}

There are stars in between the " " but it doesn’t show here??

1 Like
#1301

I think I understood:D:D:D:D…It is because the second for is not smaller < than the first for so it can’t be printed.

1 Like
#1302

now this was fun:)))))

1 Like
#1303

FizzBuzz

for (i = 1; i <= 100; i++){
if ((i % 3 === 0) && (i % 5 === 0)){
console.log(“FizzBuzz35”);
}
else if ((i % 3 === 0) && (i % 5 !=0)){
console.log(“Fizz3”);
}
else if ((i % 3 != 0) && (i % 5 === 0)) {
console.log(“Buzz5”);
}
else {
console.log(i);
}
}

Chessboard

var n = parseInt(prompt(“Enter size of the Chessboard”));

for (var i = 0; i < n; i++) {
if (i % 2 === 0){
var textC = “”;
for (j = 0; j < n/2; j++){
var textC = textC + “0”;
if ((n % 2 != 0) && (j >= n/2-1)){break}
var textC = textC + “#”;
}
console.log(textC + “\n”);
}
if (i % 2 != 0){
var textC ="";
for(j = 0; j < n/2; j++){
var textC = textC + “#”;
if ((n % 2 != 0) && (j >= n/2 -1)){break}
var textC = textC + “0”;
}
console.log(textC + “\n”)
}
}

Chessboard - Enter number of rows and columns

var y = parseInt(prompt(“Enter the number of rows”));
var x = parseInt(prompt(“Enter the number of columns”));
var textC = “”;

for (i = 1; i <= x; i++){
for (j = 1; j <= y; j++){
if ((i+j) % 2 != 0){
var textC = textC + “#”;
}
else {
var textC = textC + “0”;
}
} console.log(textC + “\n”); textC = “”;
}

1 Like
#1304
  1. Triangle
    var a=1;
    var star=" “;
    while(a<8){star=star+”#"; console.log(star); a++}

2 )Fizz Buzz
for(var a=1;a<=100;a++)
{if(a%3==0&&a%5==0){console.log(“fizzbuzz”);}
else if(a%3==0){console.log(“buzz”);}
else if(a%5==0){console.log(“fizz”);}
else{console.log(a);}}

  1. Chessboard
    var a=" # #"
    var b="# # "
    var c=1;
    for(c=1;c<9;c++){if(c%2==0){console.log(a+a);}
    else {console.log(b+b);}}
1 Like
#1305

The solution I found on google for triangle was a bit more concise than the solution found in the book I hope thats ok.

Triangle:
for(var i=1; i<=7; i++){
console.log("*".repeat(i));
}

FizzBuzz:
for (let n = 1; n <= 100; n++) {
let output = “”;
if (n % 3 == 0) output += “Fizz”;
if (n % 5 == 0) output += “Buzz”;
console.log(output || n);
}

Checkerboard:

let size = 8;

let board = “”;

for (let y = 0; y < size; y++) {
for (let x = 0; x < size; x++) {
if ((x + y) % 2 == 0) {
board += " ";
} else {
board += “#”;
}
}
board += “\n”;
}

console.log(board);

1 Like
#1306

Triangle:

for (let line = “#”; line.length < 8; line += “#”)
console.log(line);

Fizz Buzz:

for(a=1;a<100;a++){
if(a%3==0)console.log(“fizz”);
if(a%5==0)console.log(“buzz”);
else{console.log(a);}}

chessboard

let board = “”;

for (let y = 0; y < 8; y++) {
for (let x = 0; x < 8; x++) {
if ((x + y) % 2 == 0) {
board += " ";
} else {
board += “#”;
}
}
board += “\n”;
}

console.log(board);

1 Like