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Why do we check up to the square root of a prime number to determine if it is prime?

To test whether a number is prime or not, why do we have to test whether it is divisible only up to the square root of that number? ...
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How to print a dictionary line by line in Python?

...m including it here in case it can be of value to another. In running nosetest, I also found it helpful to be able to specify the output stream in the call so that sys.stderr could be used instead. import sys def dump(obj, nested_level=0, output=sys.stdout): spacing = ' ' if isinstance(...
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How to list only the file names that changed between two commits?

...ff --name-only HEAD~10 HEAD~5 to see the differences between the tenth latest commit and the fifth latest (or so). share | improve this answer | follow | ...
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Possible to do a MySQL foreign key to one of two possible tables?

... brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 4...
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How do I wait for an asynchronously dispatched block to finish?

I am testing some code that does asynchronous processing using Grand Central Dispatch. The testing code looks like this: 13...
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Testing the type of a DOM element in JavaScript

Is there a way to test the type of an element in JavaScript? 7 Answers 7 ...
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How to check if a Unix .tar.gz file is a valid file without uncompressing?

...per comment. Thanks zrajm! Edit as per comment. Thanks Frozen Flame! This test in no way implies integrity of the data. Because it was designed as a tape archival utility most implementations of tar will allow multiple copies of the same file! ...
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jQuery remove all list items from an unordered list

...bs/jquery/3.3.1/jquery.min.js"></script> <ul> <li>test</li> <li>test</li> </ul> <input type="button" value="click me" /> http://jsfiddle.net/infernalbadger/D5ss8/ ...
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Testing if a checkbox is checked with jQuery

..."#ans").is(':checked') ) ? 1 : 0; It works like this: var myVar = ( if test goes here ) ? 'ans if yes' : 'ans if no' ; Example: var myMath = ( 1 > 2 ) ? 'yes' : 'no' ; alert( myMath ); Alerts 'no' If this is helpful, please upvote Stefan Brinkmann's answer. ...
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Difference between assertEquals and assertSame in phpunit?

...ne is an int, basically: '2204' !== 2204 assertSame('2204', 2204) // this test fails assertEquals "Reports an error identified by $message if the two variables $expected and $actual are not equal." assertEquals does not appear to take datatype into consideration so using the above example o...