I often see JavaScript code which checks for undefined parameters etc. this way: if (typeof input !== “undefined”) { // do stuff } This seems kind of wasteful, since it involves both a type lookup and a string comparison, not to mention its verbosity. It’s needed because undefined could be renamed, though. My question is: … Read more
Here’s the information according to the official documentation: There are four different pairs of opening and closing tags which can be used in PHP. Two of those, <?php ?> and <script language=”php”> </script>, are always available. The other two are short tags and ASP style tags, and can be turned on and off from the … Read more
This question already has answers here: What does if __name__ == “__main__”: do? (40 answers) Closed 2 years ago. I’ve seen some code samples and tutorials that use def main(): # my code here if __name__ == “__main__”: main() But why? Is there any reason not do define your functions at the top of the … Read more
I have been reading a lot of Javascript lately and I have been noticing that the whole file is wrapped like the following in the .js files to be imported. (function() { … code … })(); What is the reason for doing this rather than a simple set of constructor functions? 9 s 9
Many C++ books contain example code like this… std::cout << “Test line” << std::endl; …so I’ve always done that too. But I’ve seen a lot of code from working developers like this instead: std::cout << “Test line\n”; Is there a technical reason to prefer one over the other, or is it just a matter of … Read more
What’s the “best” way to convert a number to a string (in terms of speed advantage, clarity advantage, memory advantage, etc) ? Some examples: String(n) n.toString() “”+n n+”” 24 s 24 like this: var foo = 45; var bar=”” + foo; Actually, even though I typically do it like this for simple convenience, over 1,000s … Read more
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Is there an official C# guideline for the order of items in terms of class structure? Does it go: Public Fields Private Fields Properties Constructors Methods ? I’m curious if there is a hard and fast rule about the order of items? I’m kind of all over the place. I want to stick with a … Read more
Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. Are there good reasons why it’s a better practice to have only one return statement in a function? Or is it okay to return from a function as soon … Read more
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 1 year ago. Improve this question Sometimes I break long conditions in ifs onto several lines. The most obvious way to do … Read more
