definitions

Wikipedia used to say* about duck-typing : In computer programming with object-oriented programming languages, duck typing is a style of dynamic typing in which an object's current set of methods and properties determines the valid semantics, rather than its inheritance from a particular class or implementation of a specific interface. (* Ed. note: Since this question was posted, the Wikipedia article has been edited to remove the word "dynamic".) It says about structural typing : A structural type system (or property-based type system) is a major class of type system, in which type

Are there any definitions of functions like sqrt() , sin() , cos() , tan() , log() , exp() (these from math.h/cmath) available ? I just wanted to know how do they work. This is an interesting question, but reading sources of efficient libraries won't get you very far unless you happen to know the method used. Here are some pointers to help you understand the classical methods. My information is by no means accurate. The following methods are only the classical ones, particular implementations can use other methods. Lookup tables are frequently used Trigonometric functions are often implemented

JavaScript kind of redefines what an Array means because an array is an object with a .length property and methods like .slice() and .join() . jQuery defines a jQuery object as "Array like", because it has a length property but it doesn't have certain array methods like join() . If I were to define the jQuery object as an object, and forget about mentioning anything to do with an array, how would I define it? What properties does it have besides length? I guess all the methods are what you see in the documentation, far exceeding the number of methods that are in an array. A jQuery object is