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Difference between dispatch_async and dispatch_sync on serial queue?
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Yes. Using serial queue ensure the serial execution of tasks. The only difference is that dispatch_sync only return after the block is finished whereas dispatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^...
What are Transient and Volatile Modifiers?
...hey are unrelated.
The transient modifier tells the Java object serialization subsystem to exclude the field when serializing an instance of the class. When the object is then deserialized, the field will be initialized to the default value; i.e. null for a reference type, and zero or false for a ...
AngularJS ng-if with multiple conditions
... <label ng-repeat="(key,val) in list">
<input type="radio" name="localityTypeRadio" ng-model="$parent.localityTypeRadio" ng-value="key" />{{key}}
<div ng-if="key == 'City' || key == 'County'">
<pre>City or County !!! {{$parent.localityTypeRadi...
Symbolicating iPhone App Crash Reports
...d the crash report receive from APPLE into a FOLDER.
OPEN terminal application and go to the folder created above (using cd command)
Run atos -arch armv7 -o APPNAME.app/APPNAME MEMORY_LOCATION_OF_CRASH. The memory location should be the one at which the app crashed as per the report.
Ex: atos -ar...
What's the point of the X-Requested-With header?
...out the use of tokens. (However, checking the Origin header could be an option in supported browsers, although you will leave old browsers vulnerable.)
New Flash bypass discovered
You may wish to combine this with a token, because Flash running on Safari on OSX can set this header if there's a red...
Sticky sidebar: stick to bottom when scrolling down, top when scrolling up
I have been looking for some time now for a solution to my sticky sidebar problem. I have a specific idea of how I would like it to act; effectively, I would like it to stick to the bottom as you scroll down, and then as soon as you scroll back up I would like it to stick to the top, in a fluid moti...
Java Generics (Wildcards)
I have a couple of questions about generic wildcards in Java:
6 Answers
6
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“PKIX path building failed” and “unable to find valid certification path to requested target”
...un I got an error about certificate sun.security.validator.ValidatorException and sun.security.provider.certpath.SunCertPathBuilderException . Then I added twitter certificate by:
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SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'
Say I have a function:
6 Answers
6
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Is there a way to detect if a browser window is not currently active?
I have JavaScript that is doing activity periodically. When the user is not looking at the site (i.e., the window or tab does not have focus), it'd be nice to not run.
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