Andy's Books
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syntax question |
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| Posted Apr 11 2012 at 6:16 PM by Pete Woodhead (petewdhd) |
Code:
var frame = 0;
var spriteImage
function init(){
setInterval("animate()", 100);
spriteImage = document.getElementById("image"); } // end init
Quote:
Harris, Andy (2010-10-28). HTML, XHTML and CSS All-In-One For Dummies (p. 488). For Dummies. Kindle Edition.
In the code snippet above why isn't there a semi colon after var spriteImage? Since it's in the book and the source code this way I'm guessing it was intentional. Is it because it proceeds the function init() I tried adding a semi colon to see if it would noticeably affect the code and it did not seem to. It just sparked my curiosity. Pete |
| Author | Message | |
| Andy |
Posted: Apr 12 2012 kl. 3:48 PM In JavaScript, semicolons are optional. I generally put them in, because most C-like syntaxes require them. However, I must have simply forgotten. (Most likely, I had been programming in Python that day, which does not require or allow semicolons at the end of the line) Since semicolons aren't required, it triggered no error, so I never saw it. I think the best practice is to add a semicolon to the end of every line (except the ones that end with a brace.) If you forget (as I did) no harm will be done. It's just a good practice. -Andy |
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| Pete Woodhead |
Posted: Apr 13 2012 kl. 2:07 PM in the dull recesses of my mind I believe you mentioned that in your book. Thanks |
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| Andy |
Posted: Apr 14 2012 kl. 2:44 PM Apparently, our brains have the same kind of dark recesses. Keep in touch, my friend... |
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