Using variables in Nginx location rules

You can’t. Nginx doesn’t really support variables in config files, and its developers mock everyone who ask for this feature to be added: “[Variables] are rather costly compared to plain static configuration. [A] macro expansion and “include” directives should be used [with] e.g. sed + make or any other common template mechanism.” http://nginx.org/en/docs/faq/variables_in_config.html You should … Read more

Why are variables “i” and “j” used for counters?

It comes ultimately from mathematics: the summation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation): It’s also used that way for collections of things, like if you have a bunch of variables x1, x2, … xn, then an arbitrary one will be known as xi. … Read more

In WebGL what are the differences between an attribute, a uniform, and a varying variable?

Copied directly from http://www.lighthouse3d.com/tutorials/glsl-tutorial/data-types-and-variables/. The actual site has much more detailed information and would be worthwhile to check out. Variable Qualifiers Qualifiers give a special meaning to the variable. The following qualifiers are available: const – The declaration is of a compile time constant. attribute – Global variables that may change per vertex, that are … Read more

When to use an object instance variable versus passing an argument to the method

Since you’re referring to instance variables, I’m assuming that you’re working in an object-oriented language. To some degree, when to use instance variables, how to define their scope, and when to use local variables is subjective, but there are a couple of rules of thumb you can follow whenever creating your classes. Instance variables are … Read more

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