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Why is React's concept of Virtual DOM said to be more performant than dirty model checking?

... dev talk at ( Pete Hunt: React: Rethinking best practices -- JSConf EU 2013 ) and the speaker mentioned that dirty-checking of the model can be slow. But isn't calculating the diff between virtual DOMs actually even less performant since the virtual DOM, in most of the cases, should be bigger tha...
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Parse date string and change format

I have a date string with the format 'Mon Feb 15 2010'. I want to change the format to '15/02/2010'. How can I do this? 9...
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Why should the “PIMPL” idiom be used? [duplicate]

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How to run Rails console in the test environment and load test_helper.rb?

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What is the difference between call and apply?

...nction.apply(valueForThis, arrayOfArgs) theFunction.call(valueForThis, arg1, arg2, ...) There is also, as of ES6, the possibility to spread the array for use with the call function, you can see the compatibilities here. Sample code: function theFunction(name, profession) { console.log("...
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How to get the filename without the extension from a path in Python?

... 1380 Getting the name of the file without the extension: import os print(os.path.splitext("/path/...
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HTML 5 tag vs Flash video. What are the pros and cons?

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Java null check why use == instead of .equals()

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Embedding ads on Android app?

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Where/How to getIntent().getExtras() in an Android Fragment? [duplicate]

... 110 What I tend to do, and I believe this is what Google intended for developers to do too, is to ...