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How to tell if a string is not defined in a Bash shell script
...for the section "Parameter Expansion" and then for this text: "When not performing substring expansion, using the forms documented below, bash tests for a parameter that is unset or null ['null' meaning the empty string]. Omitting the colon results in a test only for a parameter that is unset (...) ...
Why do I need to explicitly push a new branch?
...ists, and you want to create it, you must specify that using the -u (short form of --set-upstream) flag.
Why this is so? I guess the implementers felt that creating a branch on the remote is such a major action that it should be hard to do it by mistake. git push is something you do all the time.
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Why does PostgreSQL perform sequential scan on indexed column?
...d * 1000) is less than the total number of records, the index scan will perform better.
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How to display hidden characters by default (ZERO WIDTH SPACE ie. ​)
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i used this in a php script to make very well formatted HTML content for migration into WordPress: $string = preg_replace( '/[^\x00-\x7F]/', null, $string ); htmlspecialchars_decode( htmlentities( html_entity_decode( $string ) ) );
– aequalsb
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How do I split a string so I can access item x?
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@FactorMystic First Normal Form requires that you not put multiple values in a single field. It's literally the first rule of an RDBMS. A SPLIT() function is not supplied because it encourages poor database design, and the database will never be optimi...
jQuery .hasClass() vs .is()
...ed method of determining whether an element is assigned a class, from a performance standpoint?
4 Answers
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AngularJS : What is a factory?
...runtime, factories are a little more robust, and services are the simplest form.
Check out this question AngularJS: Service vs provider vs factory
Also this gist may be helpful in understanding the subtle differences.
Source: https://groups.google.com/forum/#!topic/angular/hVrkvaHGOfc
jsFiddle: ...
RuntimeError on windows trying python multiprocessing
I am trying my very first formal python program using Threading and Multiprocessing on a windows machine. I am unable to launch the processes though, with python giving the following message. The thing is, I am not launching my threads in the main module. The threads are handled in a separate modu...
iPad Web App: Detect Virtual Keyboard Using JavaScript in Safari?
...lanation (if you research and write one, I'd love to read it). The two platforms handle onscreen keyboards in their main browsers very differently. Android Chrome shrinks the viewport height to make room for the keyboard, so the page resizes when the keyboard is shown. iOS Safari overlays the page w...
Java equivalent of C#'s verbatim strings with @
...age that does, however, you might want to look at Groovy which has various forms of string literal.
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