Chapter 2 Exercises

BlogChain_Charles · March 20, 2020, 2:29am

nice! trying to grasp what youve done… cheers.

BlogChain_Charles · March 20, 2020, 2:54am

Really cool, just makes me feel sheite… lol

siQuang · March 24, 2020, 9:57am

Triangle

let a = '#';
for (i = 0; i < 7; i++) {
	console.log(a);
	a += '#';
}

FizzBuzz

let b = 1;
while (b <= 100) {
	if (b % 3 == 0 && b % 5 == 0) {
		console.log('FizzBuzz');
	}
	else if (b % 3 == 0) {
		console.log('Fizz');
	}
	else if (b % 5 == 0) {
		console.log('Buzz');
	}
	else {
		console.log(b);
	}

	b++;
}

Chessboard

let str = '',
	size = 8;

for (let y = 0; y < size; y++) {
	for (let x = 0; x < size; x++) {
		if ((y + x) % 2 == 0) {
			str += ' ';
		}
		else {
			str += '#';
		}
	}
	str += '\n';
}
console.log(str);

Mark1 · March 24, 2020, 3:05pm

Have I missed something? I feel like we jumped from doing things a beginner can start to grasp, to code that we haven’t really covered yet. Unless, like I say, I have missed something…

BlogChain_Charles · March 25, 2020, 1:34pm

var size = 8;
var board = "";
		for (var b = 0; b < size; b++){
			for (var a = 0; a < size; a++){
				if ((a+b) % 2 == 0) 
					board += " ";
				else
					board += "#";			
		}	board += "\n";
	}
		console.log(board);

ps: I can smell my neurons burning out… lol, is that normal while coding?!

Edit @ivga80: You can use the preformattet text to show your code.

Mark1 · March 25, 2020, 11:30am

Triangle
for (var result = “#”; result.length <=7; result = result + “#”)
console.log(result);

Fizzbuzz
for(number=0;++number<101;console.log(number%5?x||number:x+‘Buzz’))x=number%3?’’:‘Fizz’

Chessboard

var chessBoard= '',
    size= 8,
    c;

for(var i = 0 ; i < size ; i++) {
  c= i%2 ? '# ' : ' #';
  for(var j = 0 ; j < size/2 ; j++) {
    chessBoard+= c;
  }
  chessBoard+= '\n';
}

console.log(chessBoard);

Disclaimer, I do not understand this but I have been trying to understand it for 2 days. It is hard to Google help for this without coming across the answer. IMO this exercise is too hard for a beginner, seems we just skipped maybe 3 or 4 more tutorials and jumped to this. Again, just my opinion. Up until this it seemed it was progressing at a sensible pace.

ivga80 · March 25, 2020, 1:32pm

This is the second exercise in the book and it can be tricky for some in the beginning. But this exercise shows us that programming is not easy, it’s a lot of thinking and trying and failing. But that’s how we learn in the end.

I think 2 days was fast. I think most people use a lot more than that. I know I did.
Be patient and learn at your own pace.
Ivo

BlogChain_Charles · March 26, 2020, 3:05am

Hey @Mark1, if it makes you feel better… the chessboard exercise toke me two days also… my brain even started to smell… best, m8

Mark1 · March 26, 2020, 8:28am

ha! Yeah i think I just need to do more reading and watching ion videos. Just felt slightly lost as I don’t remember covering it in the course up until now, apart from a little in the book.

Cemil · March 26, 2020, 5:07pm

Exercise 1: LOOPING A TRIANGLE
for (let hashtag = “#”; hashtag.length <= 7; hashtag = hashtag + “#”) {
console.log(hashtag);
}

Exercise 2: FIZZBUZZ
Part 1:
let number = 1
while (number <= 100) {
if (number % 3 == 0) {
console.log(“Fizz”)
}
else if (number % 5 == 0) {
console.log(“Buzz”)
}
else {
console.log(number)
}
number = number + 1
}
Part 2:
let number = 1
while (number <= 100) {
if (number % 3 == 0 && number % 5 != 0) {
console.log(“Fizz”)
}
else if (number % 5 == 0 && number % 3 != 0) {
console.log(“Buzz”)
}
else if (number % 3 == 0 && number % 5 == 0) {
console.log(“FizzBuzz”)
}
else {
console.log(number)
}
number = number + 1
}

Exercise 3: CHESSBOARD
let count = 2
let character
let grid = " "
while (count < 72) {
if (count % 2 != 0 && count % 9 != 0) {
character = " "
}
else if (count % 2 == 0 && count % 9 != 0) {
character = “#”
}
else {
character = “\n”
}
grid = grid + character
count = count + 1
}
console.log(grid)

AnCaPepe · March 26, 2020, 7:26pm

FizzBuzz (a):

 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 );
 }

FizzBuzz (b):

for( var number = 0; number <= 100; number++ )
{
  var divBy3 = ( number % 3 == 0 );
  var divBy5 = ( number % 5 == 0 );
                
  if( divBy3 && divBy5 ) console.log( "FizzBuzz" );
  else if( divBy3 ) console.log( "Fizz" );
  else if( divBy5 ) console.log( "Buzz" );
  else console.log( number );
}

ChessBoard (a):

for( var row = 0; row < 8; row++ )
{
  var element = ( row % 2 == 0 ) ? " " : "#";
  var rowText = "";
  for( var column = 0; column < 8; column++ )
  {
    rowText += element;
    element = ( element == "#" ) ? " " : "#";
  }
  console.log( rowText );
}

ChessBoard (b):

var size = 8;
for( var row = 0; row < size; row++ )
{
  var element = ( row % 2 == 0 ) ? " " : "#";
  var rowText = "";
  for( var column = 0; column < size; column++ )
  {
    rowText += element;
    element = ( element == "#" ) ? " " : "#";
  }
  console.log( rowText );
}

ivga80 · March 26, 2020, 8:19pm

The best thing is to practice coding… when you have done the assignment, try to spend 1 day to just do the assignments again… mix them up… What ever… We dont learn by just watching videos. We learn when we code, let the brain get used to thinking and writing code. If you do 2-3 hours learning and 1 hour just coding, everyday for 6 months… That`s when you will really see progression…
You can do it!

rostyslavdzhohola · March 28, 2020, 3:12am

FizzBuzz

for (var i = 1;i <= 100 ;i++ ) { if ((i % 5 == 0) && (i % 3 == 0) ) { console.log("FizzBuzz"); } else if ( (i % 5 == 0) && !(i % 3 == 0) ) { console.log("Buzz"); } else if (i % 3 == 0 ) { console.log("Fizz"); } else { console.log(i); } }

Chessboard

let square = “”;
let size = 8;
for (let height = 1; height <=size; height++){
for (let width = 1; width <=size; width++){
if(( !(height % 2 == 0) && !(width % 2 == 0)) || ( (height % 2 == 0) && (width % 2 == 0) )) square += " ";
if( (!(height % 2 == 0) && (width % 2 == 0)) || ((height % 2 == 0) && !(width % 2 == 0))) square += “#”;
}
console.log(square);
square = “”;
}

Note:
I have noticed that in the examples from the book the Author solved the problems with a bit different code. If I have achieved the same result but with different code, what is the biggest difference besides the size of the code? Does the size have an impact on the time of the execution?

chaneltiana · March 28, 2020, 8:23pm

<title> great website </title>

<script>

//WRITE EXERCISE CODE
// LOOPING A TRIANGLE
var numRows = 7;

for (var row = 0; row < numRows; row++){
  var toPrint = "#";

  for(var column = 0; column < row; column++){
    toPrint += "#";
  }
  console.log(toPrint);
}

//FIZZBUZZ
var x = 100;
for(var i = 0; i <= x; i++){
    if(i % 3 == 0){
      console.log("Fizz");
    }
    else if(i % 5 == 0){
      console.log("Buzz");
    }
    else if(i % 3 == 0 && i % 5 == 0){
      console.log("FizzBuzz");
    }
}

//CHESSBOARD
for (var row = 0; row < 8; row++){
  var toPrint = " ";

  for(var column = 0; column < 8; column++){
    if((row % 2 == 0) || (column % 2 == 0)){
      toPrint += " ";
    }
    else(toPrint += "#");

    if((row % 2 == 0) && (column % 2 == 0)){
      toPrint += "#";
      }
      else(toPrint += " ");
    }

  console.log(toPrint);
}


</script>

markfoster · March 31, 2020, 8:34am

TRIANGLE
for (let row = 0; row < 7; row++) {
let toPrint ="#";

for (let col = 0; col < row; col++) {
toPrint += “#”;
}
console.log(toPrint);
}

FIZZBUZZ
for(y = 1; y < 101; y++){
var multipleOfThree = y % 3 === 0;
var multipleOfFive = y % 5 === 0;
if(multipleOfThree && multipleOfFive){
console.log(“FizzBuzz”);
}
else if(multipleOfThree){
console.log(“Fizz”);
}
else if(multipleOfFive){
console.log(“Buzz”);
}
else {
console.log(y);
}
}
CHESSBOARD
var board = “”;
for(y = 0; y < 8; y++) {
for(x = 0; x < 8; x++) {
if((x + y) % 2 ==0) {
board += “ “;
} else {
board += “#”;
}
}
board += “\n”;
}
console.log(board);

Kalimeros · April 1, 2020, 10:28am

Exercises done by myself

<body>

Time spent on coding everything by myself: 6h

Feeling at the end:

  <script>
  //Looping a triangle
  for (a=0; a<7; a++){
  var print = "#";
  for (b=0; b<a; b++){
  print += "#"
  }
  console.log(print)
  }

  //FizzBuzz
  for (a=0; a<101; a++){
  if(a%3==0){console.log("Fizz")}
  if(a%5==0){console.log("Buzz")}
  if((a%3==0) && (a%5==0)){console.log("FizzBuzz")}
  console.log(a)
  }

  //ChessBoard
  for(row=0;row<8;row++)
  {
    var print="";
    for(column=0;column<8;column++)
    {
      if((row+column)%2==0){print+=" ";}else{print+="#";}
    }
    console.log(print);
  }
  </script>

ivga80 · April 1, 2020, 1:58pm

nice job! I like it.
Ivo

Kalimeros · April 1, 2020, 2:13pm

thank you very much for the encouragement

jjkkll09 · April 4, 2020, 11:54pm

Jirure · April 7, 2020, 3:38pm

1. Triangle

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

2. FizzBuzz

for (let number = 1; number < 101 ; number += 1) {
if (number % 3 == 0) {
console.log(“Fizz”);
}
else if ((number % 5 == 0) && (number % 3 != 0)) {
console.log(“Buzz”);
}
else console.log(number)
}

for (let number = 1; number < 101 ; number += 1) {
if ((number % 3 == 0) && (number % 5 != 0)) {
console.log(“Fizz”);
}
else if ((number % 5 == 0) && (number % 3 != 0)) {
console.log(“Buzz”);
}
else if ((number % 5 == 0) && (number % 3 == 0)) {
console.log(“FizzBuzz”);
}
else console.log(number)
}

3. Chessboard

let size = 8;
let chess = “”;

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

console.log(board);