In computing, an idempotent operation is one that has no additional effect if it is called more than once with the same input parameters. For example, removing an item from a set can be considered an idempotent operation on the set. In mathematics, an idempotent operation is one where f(f(x)) = f(x). For example, the … Read more
In terms of source control, you’re downstream when you copy (clone, checkout, etc) from a repository. Information flowed “downstream” to you. When you make changes, you usually want to send them back “upstream” so they make it into that repository so that everyone pulling from the same source is working with all the same changes. … Read more
Currying is when you break down a function that takes multiple arguments into a series of functions that each take only one argument. Here’s an example in JavaScript: function add (a, b) { return a + b; } add(3, 4); // returns 7 This is a function that takes two arguments, a and b, and … Read more
What is an example of the Liskov Substitution Principle?
A declaration introduces an identifier and describes its type, be it a type, object, or function. A declaration is what the compiler needs to accept references to that identifier. These are declarations: extern int bar; extern int g(int, int); double f(int, double); // extern can be omitted for function declarations class foo; // no extern … Read more
What exactly is RESTful programming?