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Why avoid increment (“++”) and decrement (“--”) operators in JavaScript?
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My view is to always use ++ and -- by themselves on a single line, as in:
i++;
array[i] = foo;
instead of
array[++i] = foo;
Anything beyond that can be confusing to some programmers and is just not worth it in my view. For loops are an exception,...
Xcode debugging - displaying images
I love using the Xcode debugger. You can take a look at a variable's value and even change it.
6 Answers
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Debug vs. Release performance
...ly true. In debug mode, the compiler emits debug symbols for all variables and compiles the code as is. In release mode, some optimizations are included:
unused variables do not get compiled at all
some loop variables are taken out of the loop by the compiler if they are proven to be invariants
cod...
How to avoid “if” chains?
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You can use an && (logic AND):
if (executeStepA() && executeStepB() && executeStepC()){
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}
executeThisFunctionInAnyCase();
this will satisfy both of your requirements:
executeStep<X>() should evaluate only if the pre...
How to convert NSDate into unix timestamp iphone sdk?
... answered Jun 8 '10 at 12:06
BAndonovskiBAndonovski
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What does “xmlns” in XML mean?
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It defines an XML Namespace.
In your example, the Namespace Prefix is "android" and the Namespace URI is "http://schemas.android.com/apk/res/android"
In the document, you see elements like: <android:foo />
Think of the namespace prefix as a variable with a short name alias for the full n...
MySQL error 2006: mysql server has gone away
I'm running a server at my office to process some files and report the results to a remote MySQL server.
28 Answers
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How to have jQuery restrict file types on upload?
...would like to have jQuery limit a file upload field to only jpg/jpeg, png, and gif. I am doing backend checking with PHP already. I am running my submit button through a JavaScript function already so I really just need to know how to check for the file types before submit or alert.
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Difference between a “coroutine” and a “thread”?
What are the differences between a "coroutine" and a "thread"?
6 Answers
6
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Spring Boot - Cannot determine embedded database driver class for database type NONE
... properties that you can set.
You'll need to provide the appropriate url and driver class name:
spring.datasource.url = …
spring.datasource.driver-class-name = …
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