Loop examples in JavaScript

INDEX

Problem 1: Print numbers from 1 to 50

 for(i=1;i<=50;i++){
   document.write(i+" ");
 }

Problem 2: Print numbers from 50 to 1

 for(i=50;i>=1;i--){
   document.write(i+" ");
 }

Problem 3: Print odd numbers from 1 to 20

 for(i=1;i<=20;i=i+2){
   document.write(i+" ");
 }

Problem 4: Print even numbers from 1 to 20

 for(i=2;i<=20;i=i+2){
   document.write(i+" ");
 }

Problem 5: Print numbers between 10 to 20

 for(i=10;i<=20;i=i+1){
   document.write(i+" ");
 }

Problem 6: Print numbers between 10 to 20 except 13 and 17

 for(i=10;i<=20;i=i+1){
   if(i==13 || i==17) continue;
   document.write(i+" ");
 }

Problem 7: Print numbers between 1 to 20 which are divisible by 4

 for(i=4;i<=20;i=i+4){
   document.write(i+" ");
 }

 for(i=4;i<=20;i=i+1){
    if(i%4==0)
    document.write(i+" ");
 }

Problem 8: Print numbers between 1 to 10 separated by + sign and add up the numbers as follows:

var sum=0;
 for(i=1;i<=10;i++){
   document.write(i);
   if(i!=10)document.write("+");
   sum+=i;
 }
 document.write(" = "+sum);

Problem 9: Print odd numbers between 1 to 10 separated by + sign and add up the numbers as follows:

var sum=0;
 for(i=1;i<=10;i=i+2){
   document.write(i);
   if(i!=9)document.write("+");
   sum+=i;
 }
 document.write(" = "+sum);

Problem 10: Create a times table for 6 as follows:

for(i=1;i<=12;i++){
   
   document.write(i+" x 6 ="+6*i);
   document.write("<br/>");
       
 }

Problem 11: Find how many positive, how many negative and how many zero numbers from the following numbers

var data=[2,4,-9,5,-7,0,-5,0,3];

var p=0,n=0,z=0;
for(var d of data){
  
  if(d>0){
	 p++;  
  }else if(d<0){
	 n++;
  }else{
	 z++;  
  }//end if   	
}//end loop

document.write("Positive:"+p+"<br/>");
document.write("Negative:"+n+"<br/>");
document.write("Zero:"+z);