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Why (0-6) is -6 = False? [duplicate]
Today I tried to debug my project and after a few hours of analysing I'd got this:
4 Answers
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isset() and empty() - what to use
...er something is set or not use isset.
Empty checks if the variable is set and if it is it checks it for null, "", 0, etc
Isset just checks if is it set, it could be anything not null
With empty, the following things are considered empty:
"" (an empty string)
0 (0 as an integer)
0.0 (0 as a floa...
When should i use npm with “-g” flag and why?
...g npm for js package management recently. Although I do have a fair understanding of package management in different enivronments(lets say using apt, rvm/gem, pythonbrew/virtualenv/pip), I don't quite understand how npm fully fits in.
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iOS Equivalent For Android Shared Preferences
I am porting an Android app to iOS, one thing I used was the Shared Preferences in Android to save each time a level was complete.
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Dump Mongo Collection into JSON format
...) which can dump a collection. This utility uses the native libmongoclient and is likely the fastest method.
mongoexport -d <database> -c <collection_name>
Also helpful:
-o: write the output to file, otherwise standard output is used (docs)
--jsonArray: generates a valid json docume...
Clear Text Selection with JavaScript
...ered Jul 3 '10 at 0:46
Gert GrenanderGert Grenander
15.7k66 gold badges3535 silver badges4343 bronze badges
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Getting the parent of a directory in Bash
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and the variant I'm using to get the parent of current working directory: parentdir=$(dirname `pwd`)
– TheGrimmScientist
Jul 11 '15 at 21:31
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Sprintf equivalent in Java
...lt'
String result = String.format("%4d", i * j);
// Write the result to standard output
System.out.println( result );
See format and its syntax
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How to display a confirmation dialog when clicking an link?
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Inline event handler
In the most simple way, you can use the confirm() function in an inline onclick handler.
<a href="delete.php?id=22" onclick="return confirm('Are you sure?')">Link</a>
Advanced event handling
But normal...
Launch an app from within another (iPhone)
...app?, For example in my application if I want the user to push a button and launch right into the Phone app (close the current app, open the Phone app) .
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