JavaScript Begginer Loop+Conditional question

D4nielRocha — Wed, 13 Nov 2019 14:52:34 +0000

Hi there,

I've just started to study javascript and I'm reading the Eloquent Javascript book, recommended by several friends and websites I've read.
I just finished the 3 chapter where I had to write one particular piece of code to answer to one of the challenges on the book. I couldn't do it at first and them I looked at the answer provided by the book, and I still can't figure it out why it was done like that.

Could somebody try to explain me in a better way as to why this code is written like this? Thank you so much for all replies.

var size = 8;
for (var i = 1; i <= size; i++) {

var line = (i % 2)?'':' ';

for (var j = 1; j < size; j++) {
line += (j % 2)?'#':' ';
}

console.log(line);

}

The task was to write a code that would produce a table chess with spaces and # simbols with a size of 8x8.

What I can't quite understand is:

1- Why we use (i % 2) in this case?
2-What does the ? symbol represents on this statement?

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JavaScript Begginer Loop+Conditional question