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Get first n characters of a string

...} Update 3: It's been a while since I wrote this answer and I don't actually use this code any more. I prefer this function which prevents breaking the string in the middle of a word using the wordwrap function: function truncate($string,$length=100,$append="…") { $string = trim($st...
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Add custom messages in assert?

...rk; they’re compile-time constants and their use in this context is trivially optimized away. There is no runtime cost. – zneak Aug 9 '19 at 8:46 ...
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How to copy a java.util.List into another java.util.List

...rch for copying a list suggested me to use Collections.copy() method. In all the examples I saw, the destination list was supposed to contain the exact number of items for the copying to take place. ...
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How does _gaq.push(['_trackPageLoadTime']) work?

...precated and its functionality has been set as a default setting. (Functionally speaking, it has gone from being an opt-in feature to being an opt-out feature.) _setSiteSpeedSampleRate is the new function for setting the sample rate on this feature; its default value is 1 (as in 1%). To opt out of ...
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How to loop through an array containing objects and access their properties

... Note that it is important that you really do have an array. If you got yourArray from something like document.getElementsByClassName that would be an HTMLCollection, not an array. Then this question could be helpful. – J0ANMM ...
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How to find out what type of a Mat object is with Mat::type() in OpenCV

..."; r += (chans+'0'); return r; } If M is a var of type Mat you can call it like so: string ty = type2str( M.type() ); printf("Matrix: %s %dx%d \n", ty.c_str(), M.cols, M.rows ); Will output data such as: Matrix: 8UC3 640x480 Matrix: 64FC1 3x2 Its worth noting that there are also Matr...
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How to intercept all AJAX requests made by different JS libraries

...erent JS libraries (AngularJS, OpenLayers,...) and need a way to intercept all AJAX responses to be able, in case the logged user session expired (response gets back with 401 Unauthorized status), to redirect him to the login page. ...
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What's the difference between dist-packages and site-packages?

I'm a bit miffed by the python package installation process. Specifically, what's the difference between packages installed in the dist-packages directory and the site-packages directory? ...
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Calling a function of a module by using its name (a string)

What is the best way to go about calling a function given a string with the function's name in a Python program. For example, let's say that I have a module foo , and I have a string whose content is "bar" . What is the best way to call foo.bar() ? ...
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Is there a way to make mv create the directory to be moved to if it doesn't exist?

...ectories don't exist, is there some way to have those directories automatically created, so that you would only have to type ...