New to Javascript - For Loop

Question

I'm trying to learn Javascript and I'm looking at the for loop.

I'm trying to loop through 4 numbers which I've done successfully.

for (i=0;i<5;i++) {
 console.log(i + " and " + (i+1));
}

However I'm trying to achieve something like this:

0 1 
0 2
0 3
0 4
1 2
1 3
...etc

Is that possible with a for loop?

Thanks

Terry

• yent: Yeah, just nest 2 loops.

Answer 1

Firstly your loop will be iterating through 5 numbers. 0, 1, 2, 3, 4 (count them)

You can achieve this by using two nested for loops

for (var i = 0; i < 5; i++) {
 for(var j = i+1; j < 5; j++){
 console.log(i + " " + j);
 }
}

this will give you:

0 1
0 2
0 3
0 4
1 2
...
3 4

NOTE: that this seems to match you pattern of not including "1 1" for example

Answer 2

I think the question is ask for just one for loop.

here is the correct answer you want to want:

for (i=0,j=0;i<5;i++) {
 console.log(j + " and " + (i+1));
 if(j<5&&i==4){
 j++;i=0;
 }
}

Answer 3

for (i=0;i<5;i++) {
 for (j=i+1;j<5;j++) {
 console.log(i + " and " + j);
 }
}

Answer 4

Nested loops will do the trick:

for (var i = 0; i < 5; i++) {
 for (var j = i + 1; j < 5; j++) {
 console.log(i + ' and ' + j);
 }
}