A definition is where a value or function is described, i.e. the compiler or programmer is told precisely what it is, e.g. int foo() { return 1; } int var; // or, e.g. int var = 5; but this is clearer. A declaration tells the compiler, or programmer that the function or variable exists. e.g. … Read more
From the official Sun glossary: deprecation: Refers to a class, interface, constructor, method or field that is no longer recommended, and may cease to exist in a future version. From the how-and-when to deprecate guide: You may have heard the term, “self-deprecating humor,” or humor that minimizes the speaker’s importance. A deprecated class or method … Read more
Java always passes arguments by value, NOT by reference. In your example, you are still passing obj by its value, not the reference itself. Inside your method changeName, you are assigning another (local) reference, obj, to the same object you passed it as an argument. Once you modify that reference, you are modifying the original … Read more
It’s the query, or sometimes the query string. To pinch a useful diagram from the URI RFC: foo://example.com:8042/over/there?name=ferret#nose \_/ \______________/\_________/ \_________/ \__/ | | | | | scheme authority path query fragment
A Fold for Every Occasion We can actually come up with a generic notion of folding which can apply to a whole bunch of different types. That is, we can systematically define a fold function for lists, trees and more. This generic notion of fold corresponds to the catamorphisms @pelotom mentioned in his comment. Recursive … Read more
What “exactly” an API key is used for depends very much on who issues it, and what services it’s being used for. By and large, however, an API key is the name given to some form of secret token which is submitted alongside web service (or similar) requests in order to identify the origin of … Read more
This is based on the Expression Evaluator grammar by Terrence Parr. The grammar for this example: grammar Expr002; options { output=AST; ASTLabelType=CommonTree; // type of $stat.tree ref etc… } prog : ( stat )+ ; stat : expr NEWLINE -> expr | ID ‘=’ expr NEWLINE -> ^(‘=’ ID expr) | NEWLINE -> ; expr … Read more
Images are frozen immutable snapshots of live containers. Containers are running (or stopped) instances of some image. Start with the base image called ‘ubuntu’. Let’s run bash interactively within the ubuntu image and create a file. We’ll use the -i and -t flags to give us an interactive bash shell. $ docker run -i -t … Read more
Adding # noqa to a line indicates that the linter (a program that automatically checks code quality) should not check this line. Any warnings that code may have generated will be ignored. That line may have something that “looks bad” to the linter, but the developer understands and intends it to be there for some … Read more
x86 can be a broad term that covers all CPUs that are backwards-compatible with 8086, and all extensions to the architecture including x86-64. Note that IA-64 is not x86 at all, it’s Itanium (a 64-bit VLIW architecture with explicit speculation / parallelism). It was also designed by Intel, but is totally unrelated to x86 in … Read more