Javascript While loop integers

Question

I have to create a while loop displaying the integers from 1-20 but only 5 integers per line. I can't get the 5 integers per line part. What is the best way to do that?

• Aleksei Zabrodskii: Have you even try this yourself?
• jonathan miller: yes but not like the way you had it. as you might have noticed from my question my coding right now is rather basic
• Aleksei Zabrodskii: I'm asking because posting your pieces of code may work better from learning point-of-view. You'll be able to understand which mistakes you made, how to avoid it in future, etc. In similar "hello-world" exampled that could be not so obvious, but IMO it always better to post something you did yourself.
• Will Klein: I agree with elmigranto, try posting what you have so people can provide a solution AND help you with your own code. I understand being new to this though. At the very least, ask questions on the answers if you have any.

Answer 1

Check if it's the next item after a multiple of 5 and if the current item is not the first item. If it is, also print out a newline. For example:

for(var i = 1; i <= 20; i++) {
 print(i); // Or however you're outputting it
 if(i % 5 === 1 && i > 1) {
 print('\n');
 }
}

Answer 2

Here's a solution that builds a string and displays an alert box with the result.

var i = 0, result = "";
while (i++ < 20) {
 result += i + " ";
 // check to see if we're at 5/10/15/20 to add a new-line
 if (i % 5 === 0) {
 result += "\n";
 }
}
alert(result);

jsFiddle to test: http://jsfiddle.net/willslab/KUVkX/3/

• Will Klein: I cleaned up the code very slightly. Thank you for accepting, let me know if you have any questions about the code.

Answer 3

You can do...

if ( ! (i % 5)) {
 // Create new line.
}

jsFiddle.

Answer 4

See no while loops in previous answers =)

function generateLine(start, nElements, separator) {
 var i = start;
 var range = [];
 while (range.length < nElements) range.push(i++);
 return range.join(separator) + '\n';
}
function generate(start, end, elementsInLine, inlineSeparator) {
 var lines = [];
 while (start < end) {
 lines.push( generateLine(start, elementsInLine, inlineSeparator));
 start += elementsInLine;
 }
 return lines.join('');
}
console.log( generate(1, 20, 5, ' ') );

• Will Klein: This is a nice solution, I thought of writing a generic function as well. I wasn't sure it would be easy enough to understand though.