Chapter 3 Exercises

[a.l.a.i.n]

1.  function min(a,b){
             if(a<=b){
              console.log(a,'ist kleiner als',b);
         } else {
              console.log(b,'ist kleiner als',a); 
        }
      }
   console.log(min(5,9)); 
   

2.  function even(zahl) {
     var zahl = prompt('Zahl');
     if (zahl==0 || zahl%-2==0 ){
    console.log('is even')
   
   } else {
   console.log(zahl,'is odd')
     }
   }
   console.log(even())
   

3. function countBs(word){
          var n = word.length;
          var letter;
          var count = 0;
   
   
          for( var i = 0 ; i < n  ; i++ ){
   
            letter = word[i];
          
            if(letter == "B" ){count++ ;}
   
          } 
   
          return count;
      }
   
       console.log(countBs('BuBBlegum')); `
   

couldn’ solve the last one alone. Didn’t create a variable n = word.length and find the mistake

[mkhuang]

A) Minimum

function minimum(x, y){
if (x < y) return x;
else return y;
}

B) Recursion

function isEven(number){
if (number == 0) return (“EVEN”);
else if (number == 1) return (“ODD”);
else if (number < 0) return isEven(-number);
else return isEven(number - 2);
}

C) Bean counting

function countBs(stringText){
return countChar(stringText, “B”);
}

function countChar(stringText, c){
let count = 0;
for(var i = 0; i < stringText.length; i++){
if(stringText[i] == c) count++;
}
return count;
}

[andylukepd]

need help with exercise 2 recursion. my answer i had was origionally

function isEven (x){
for (var counter = x; counter<2 ;counter-2){};

if (counter=0) {return (true)};
if (counter=1){return (false)};
}

var answer = isEven(10);
console.log ("The answer is " + answer)

This returned an answer of false regardless of what number i had in as x
when i put if (counter==0) instead of =0 i would get number undefined. I know my solution is clearly wrong but i dont understand why can someone please help

[Ali_H]

Minimum:
var a = 1;
var b = 2;
function min(a,b){
if b>a{
return a;
}
else a>b
return b;
}

Recursion:
function isEven(num){
if (num%2=0);
return true;
}
if (num%2=1){
return false;
}
else (num<0){
num = num*-1;
}

Bean counting:
function countB(string){
for (let count=0; count<string.length; count++){
if (string[count]=“B”){
count = count+1;
}
}
return count;
}

[Zaqoy]

Minimum

      function minimum(a,b){
        if(typeof(a) == "number" && typeof(b) == "number"){
          if(a<b) return a;
          else if(b<a) return b;
          else return "These two values are the equal!";
        }
        else return "The values entered are not both numbers!";
      }

Recursion

      function isEven(num){
        if(typeof(num) == "number") {
          if(num == 0) return true;
          else if (num == 1) return false;
          else if (num < 0) return isEven(-num);
          else return isEven(num - 2);
        }
        else return "Input is not a number!"
      }

Bean Counting

      function countLetter(words, letter){
        if(typeof(words) == "string" && typeof(letter) == "string"){
          let counter = 0;
          for(i = 0; i < words.length; i++){
            if(words[i] == letter) counter +=1;
          }
          return counter;
        }
        else return "Inputs are not both strings!"
      }

[dpturner]

Minimum
function min(a,b) {
if (a<b) return a;
else return b;}
console.log (min (1,5));
// 1

Recursion
function isEven (n) {
if (n=0) return true;
else if (n==1) return false;
else if (n<0) return isEven (-n);
else return isEven (n-2);}

Bean Counting
function countBs (string) {
let count=0;
for (let x=0; x<string.length; x++) {
if (string (x) == “B”){
count += 1;}
}
function countChar (string,char); {
let count=0;
for (let x=0; x<string.length; x++) {
string(x) == char;
count += 1;}
}

[mBuix90]

Here are my solutions, if you know a more eloquent to write this, please let me know, as I it is one of my goals to write code in a better way.

Thank you!

1. Minimum

function minimum(a,b){
        if (a<b) return a;
        else return b;
}
console.log(minimum(0,10));
console.log(minimum(0,-10));

2. Recursion

function isEven(a){
        if (a==1) return false;
        else if (a==0) return true;
        else if (a<0) return isEven(-a);
        else return isEven(a-2);
      }
      console.log(isEven(50));
      console.log(isEven(75));

3. Bean Counting

function countBs(word){
        let B=0;
        for (i = 0; i < word.length; i++) {
          if (word[i]=="B") B+=1;
        }
        return B;
}

function countChar(word,char){
        let n=0;
        for (i = 0; i < word.length; i++) {
          if (word[i]==char) n+=1;
        }
        return n;
}
console.log(countBs("BBC"));
console.log(countChar("kakkerlak", "k"));

[Joeyj007]

**Minimum**

	function min(a, b){
		if (a  < b){
		  return a}
		else {return b}
	};
	console.log(min(1, 2));

**Recursion**

function isEven(N){
		if (N === 1){
		 return false}
		if (N === 0){
		 return true}
	else {
	 return isEven (N - 2)
	  };
};
console.log(isEven(50));
console.log(isEven(75));


 function isEven(N){
		if (N === 1){
		 return false}
		if (N === 0){
		 return true}
		if (N < 0){
		return isEven(N + 2)}
	else {
	 return isEven (N - 2)
	  };
};
console.log(isEven(-1));


**Bean Counting**

function countBs(string) {
  let result = 0;
  for (let i = 0; i <= string.length - 1; i++) {
    if (string[i] === 'B') {
      result++;
    }
  }
  return result;
}
function countChar(string, character) {
}
console.log(countBs("BBC"));



function countChar(string, character) {
  let result = 0;
  for (let i = 0; i < string.length; i++) {
    if (string[i] === character) {
      result++;
    }
  }
  return result;
  }
console.log(countChar("kakkerlak", "k"));

[andylukepd]

@Malik please help if you can

[MatthiasTay]

function min(a, b) {
if (a < b) return a;
else return b;
}

function isEven(n){
if (n==0) return true;
else if (n==1) return false;
else if (n<0) return isEven(-n);
else return isEven(n-2);
}

function countBs(string){
return countChar(string, “B”);
}

function countChar(string, Char){
let count = 0;
for (let a=0; a<string.length; a++){
if (string(a) == Char){
count +=1;
}
}
return count;
}

[Verses]

MINIMUM:

function min(a,b){
		if(a<b) return a;
		else return b;
}
console.log(min(45, 90));
console.log(min(700, -600));
console.log(min(780, 90));
console.log(min(-700, -600));

Recursion:

function isEven(x){
        if (x==1) return false;
        else if (x==0) return true;
        else if (x<0) return isEven(-x);
        else return isEven(x-2);
      }

console.log(isEven(50));
console.log(isEven(75));
console.log(isEven(-1));

Bean Counting:

function countBs(string) {
        let B=0;
        for (w = 0; w < string.length; w++) {
          if (string[w]=="B") B+=1;
        }
        return B;
}

function countChar(string,char){
        let n=0;
        for (w = 0; w < string.length; w++) {
          if (string[w]==char) n+=1;
        }
        return n;
}

console.log(countBs("BBC"));
console.log(countChar("kakkerlak", "k"));
console.log(countBs("Barracuda Barney"));
console.log(countChar("Mississippi", "s"));

[andylukepd]

minimum

function min(x, y) {
if (x < y) return x;
else return y;
}

console.log (min(3,7));
console.log (min(19,2));

isEven

function isEven(x){
  if (x==0) return true;
  if (x==1) return false;
  if (x>1) return isEven(x-2);
}
 console.log(isEven (50))

beancounter

function countBs(x){
  var y=0
    for (var n =0 ; n<(x.length) ;n++){
      if (x [n]=="B") {y=y+1;}
    }

  return y
}

console.log (countBs ("ABC"))

function countChar(x , z){
  var y=0
    for (var n =0 ; n<(x.length) ;n++){
      if (x [n]==z) {y=y+1;}
    }

  return y
}

console.log (countChar("ABC", "A"))

[thecil]

Hey @andylukepd, hope you are well.

I dont understand what are you trying to do with the for loop.
for (var counter = x; counter<2 ;counter-2)
when counter = 10, 10 is greater than 2, 10 minus 2…

Also you are not comparing in the conditionals if (counter=0), where it should be counter==0.

While the idea of the function is to validate the number. Check the results on other students to give you a good idea of it

Carlos Z

[Malik]

Hi @andylukepd,

Instead of looping your counter, I would advise you to simply check the divisibility of the number and then return true or false. It is way simpler this way. Please check the code that I have given below –

function isEven(x) {
        if (x % 2 == 0) {
          return true;
        } else {
          return false;
        }
      }

Hope this helps.

[MPatrick]

1. Minimum

   function min (x,y){
     if (x==y) 
       document.write ("false");
     else if (x<y)
   	document.write (x);
     else
    	document.write (y);
    }    
   

2. Recursion

   function isEven(n){
      if (n==0)
         document.write ("true");
      else if (n<0)
         return isEven (-n);
      else if (n==1)
         document.write ("false");
      else
         return isEven (n-2);   
   }
   

3. Bean Counting

3.1. Count Bs

 function countBs (string) {
     var numBs = 0;
     for (position=0; position < string.length; position++){
         if (string[position] === “B”){
             numBs = numBs + 1
         }
     }
     return numBs
 }

3.2. Count Characters

 function countChar (string, char) {
     var numChars = 0;
     for (position=0; position < string.length; position++){
         if (string[position] === char){
            numChars = numChars + 1;
         }
     }
     return numChars;
 }

[CryptoByNight]

1. Minimum

function min(a, b) {
if (a < b)
return a;
else
return b;
}

2. Recursion

function isEven(x) {
if (x == 0)
return true;
else if (x == 1)
return false;
else if (x < 0)
return isEven(-x);
else
return isEven(x - 2);
}

3. Bean Counting

function countChar(str, letter) {
let match = 0;
for (let i = 0; i < str.length; i++) {
if (str[i] == letter) {
match += 1;
}
}
return match;
}

function countBs(str) {
return countChar(str, “A”);
}

[CryptoByNight]

Can someone please tell me how to easily paste code that is formatted so it appears nicely as in some of the other posts?

[pmgoff]

Chapter 3
**Minimum Exercise **
function min(param1, param2) {
if (param2 === undefined){
return param1;
}
if (param1 < param2) {
return param1;
}
else {
return param2;
}
}
console.log (min(10,2));
console.log (min(-2,2));
console.log (min(2,2));
console.log (min(10));

**Recursion Exercise **

function isEven(n) {
if (n < 0) {
//Make n not negative
n = -n;
}
//if n is 0
if (n === 0) {
//return true
return true;
}
if (n === 1){
//if n is 1
//return false
return false;
}
return isEven(n -2);
// in all other cases, apply isEven to n minus 2
}

console.log(isEven(50));
console.log(isEven(75));
console.log(isEven(-1));

Bean counting Exercise

function countBs(string) {
return countChar(string, ‘B’);
}

function countChar(string, character) {
//crate a result, set to 0
let result = 0;
//loop over the string
for(let i = 0; i < string.length; i++){
//if the current character is a “b”
if (string[i] === character){
//increment our result by 1
result = result + 1;
}
}
//reutrn result;
return result;
}
console.log(countBs(“BBC”));
console.log(countChar(“kakkerlakakak”, “k”));

[thecil]

Check this guide

FAQ - How to post code in the forum

Thanks to @thecil for this guide How to post readable code in the forum You can use the “Preformatted Text” button to encapsulate any kind of code you want to show in your post. The demonstration, below, shows you how, and what the formatted code will look like: function formatText() { let words = "I'm a preformatted text button. Please use me wisely!"; } [image] [preformatted text]

Carlos Z

[diegosan]

Hi guys, I’ve struggled a bit with these exercises, especially with ‘recursion’ and ‘bean counting’. So far I’ve been understanding the fundamentals, but still find it a bit hard to organize my code structure and thinking about these abstract solutions.

Any advice will be greatly appreciated!

    <script>
    // find the min number
    
    function minNumber(a,b) {

      if (a < b) {
        console.log(a);
      }
      else {
        console.log(b);
      };
    };

    minNumber(8,6);
    </script>

    <script>
    // recursion

    function isEven(number) {
      if (number == 0) {
        return true;
      }
      else if (number == 1) {
        return false;
      }
      else if (number < 0) {
        return isEven(-number);

      } else {
        return isEven(number - 2);
      }
    }

    console.log(isEven(5));
    </script>

    <script>
    // bean counting

    function countBs(string, character) {
      let counter = 0;
      for (i = 0; i < string.length; i++) {
        if (string[i] == character) {
          counter += 1;
        }
      }
      return counter;
    }

    function countChar(string) {
      return countBs(string, "B");
    }

    console.log(countChar("the Bword"));

    console.log(countBs("More BBBs!", "B"));
    </script>