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Concatenating null strings in Java [duplicate]
Why does the following work? I would expect a NullPointerException to be thrown.
5 Answers
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Hash collision in git
...n this we can ask the question...
How many commits do you need in a repository before you should start worrying about collisions?
This relates to so called "Birthday attacks", which in turn refers to the "Birthday Paradox" or "Birthday Problem", which states that when you pick randomly from a given ...
@class vs. #import
It is to my understanding that one should use a forward-class declaration in the event ClassA needs to include a ClassB header, and ClassB needs to include a ClassA header to avoid any circular inclusions. I also understand that an #import is a simple ifndef so that an include only happens once....
Replace multiple characters in one replace call
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Use the OR operator (|):
var str = '#this #is__ __#a test###__';
str.replace(/#|_/g,''); // result: "this is a test"
You could also use a character class:
str.replace(/[#_]/g,'');
Fiddle
If you want to replace the hash with on...
Underscore: sortBy() based on multiple attributes
I am trying to sort an array with objects based on multiple attributes. I.e if the first attribute is the same between two objects a second attribute should be used to comapare the two objects. For example, consider the following array:
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Why malloc+memset is slower than calloc?
...own that calloc is different than malloc in that it initializes the memory allocated. With calloc , the memory is set to zero. With malloc , the memory is not cleared.
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How to select different app.config for several build configurations
...ing to have a separate second app.config file that will hold the settings for CI server.
10 Answers
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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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About “*.d.ts” in TypeScript
...y someone that this kind of file is something like "head file" in C++ but for JS only. But I cannot convert a pure JS file to *.d.ts file unless I forcely change the *.js to *.ts . So I have three files:
a JS file, a TS file and a *.d.ts file.
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How to visualize an XML schema? [closed]
...command line java application xsdvi creates an interactive diagram in SVG format from an XML Schema Definition. The generated SVG file can be displayed by a modern web browser where the user can expand and collapse the tree by mouse clicking.
Here is an example of a generated diagram
http://xsdvi....