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Measuring the distance between two coordinates in PHP
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Not long ago I wrote an example of the haversine formula, and published it on my website:
/**
* Calculates the great-circle distance between two points, with
* the Haversine formula.
* @param float $latitudeFrom Latitude of start point in [deg de...
How to hide element using Twitter Bootstrap and show it using jQuery?
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The right answer
Bootstrap 4.x
Bootstrap 4.x uses the new .d-none class. Instead of using either .hidden, or .hide if you're using Bootstrap 4.x use .d-none.
<div id="myId" class="d-none">Foobar</div>
To show it: $("#myId").removeClass('...
Why (0-6) is -6 = False? [duplicate]
...the same address with CPython, thus the is test passes.
This artifact is explained in detail in http://www.laurentluce.com/posts/python-integer-objects-implementation/, and we could check the current source code in http://hg.python.org/cpython/file/tip/Objects/longobject.c.
A specific structure...
Prevent double curly brace notation from displaying momentarily before angular.js compiles/interpola
...ts to load, there can be a good amount of time where the literal {{stringExpression}} in the markup are displayed, then disappear once angular is done with it's compilation/interpolation of the document.
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How to convert a Django QuerySet to a list
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You could do this:
import itertools
ids = set(existing_answer.answer.id for existing_answer in existing_question_answers)
answers = itertools.ifilter(lambda x: x.id not in ids, answers)
Read when QuerySets are evaluated and note that it is not good to load the whole res...
What does the leading semicolon in JavaScript libraries do?
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No: In your example, you'd get (function(){...})()(function(){...})().
– Aaron Digulla
Dec 9 '09 at 13:52
8
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Append a dictionary to a dictionary [duplicate]
I have two existing dictionaries, and I wish to 'append' one of them to the other. By that I mean that the key,values of the other dictionary should be made into the first dictionary. For example:
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Internet Explorer 11 disable “display intranet sites in compatibility view” via meta tag not working
...e below html5 doctype and edge compatibility meta tag to force Internet Explorer to not emulate an older browser version, and this has worked ok.
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Transposing a 2D-array in JavaScript
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array[0].map((_, colIndex) => array.map(row => row[colIndex]));
map calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexes of the a...
Try-finally block prevents StackOverflowError
...e a really, really long time. The order of time is O(2^N) where N is the maximum stack depth.
Imagine the maximum depth is 5
foo() calls
foo() calls
foo() calls
foo() calls
foo() which fails to call foo()
finally calls
foo() which fails ...