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Creating an Android trial application that expires after a fixed time period

... run the app save the date/time to a file, database, or shared preferences and every time you run the app after that check to see if the trial period has ended. This is easy to circumvent because uninstalling and reinstalling will allow the user to have another trial period. The second approach is...
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jQuery - What are differences between $(document).ready and $(window).load?

...$(document).ready(function() { // executes when HTML-Document is loaded and DOM is ready console.log("document is ready"); }); $(window).load(function() { // executes when complete page is fully loaded, including all frames, objects and images console.log("window is loaded"); }); ...
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How do you represent a graph in Haskell?

...n be shared any ADT that can contain a member of the type (including lists and trees) is really a DAG (Directed Acyclic Graph). The fundamental issue is that if you have values A and B, with A containing B and B containing A, then neither can be created before the other exists. Because Haskell is la...
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How can we match a^n b^n with Java regex?

...a regex pattern to match anbn. It uses a positive lookahead for assertion, and one nested reference for "counting". Rather than immediately giving out the pattern, this answer will guide readers through the process of deriving it. Various hints are given as the solution is slowly constructed. In thi...
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RegEx match open tags except XHTML self-contained tags

... tool that can be used to correctly parse HTML. As I have answered in HTML-and-regex questions here so many times before, the use of regex will not allow you to consume HTML. Regular expressions are a tool that is insufficiently sophisticated to understand the constructs employed by HTML. HTML is no...
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What requests do browsers' “F5” and “Ctrl + F5” refreshes generate?

Is there a standard for what actions F5 and Ctrl + F5 trigger in web browsers? 6 Answers ...
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How to profile a bash shell script slow startup?

...bashstart.PID.log that shows the seconds.nanoseconds timestamp of each command that was executed. The difference from one time to the next is the amount of time that the intervening step took. As you narrow things down, you can move set -x later and set +x earlier (or bracket several sections of in...
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Should I use .done() and .fail() for new jQuery AJAX code instead of success and error

... As stated by user2246674, using success and error as parameter of the ajax function is valid. To be consistent with precedent answer, reading the doc : Deprecation Notice: The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callbacks will be deprecated in jQu...
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How to design a database for User Defined Fields?

...s a variant of #2). This answer is specifically tailored to this situation and the description of the data distribution and access patterns described. Pros: Because you indicate that some UDFs have values for a small portion of the overall data set, a separate table would give you the best perfor...
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Single huge .css file vs. multiple smaller specific .css files? [closed]

...liver a single, minimised CSS file for the site (which will be far smaller and faster than a normal single CSS source file), while maintaining the nicest development environment, with everything neatly split into components. Sass and LESS have the added advantage of variables, nesting and other way...