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The first line of the factorial function describes the type of this function; while it is optional, it is considered to be good style [1] to include it. It can be read as the function factorial (factorial) has type (::) from integer to integer (Integer -> Integer). That is, it takes an integer as an argument, and returns another integer.
Short-circuit evaluation, minimal evaluation, or McCarthy evaluation (after John McCarthy) is the semantics of some Boolean operators in some programming languages in which the second argument is executed or evaluated only if the first argument does not suffice to determine the value of the expression: when the first argument of the AND function evaluates to false, the overall value must be ...
In programming languages (especially functional programming languages) and type theory, an option type or maybe type is a polymorphic type that represents encapsulation of an optional value; e.g., it is used as the return type of functions which may or may not return a meaningful value when they are applied.
All parameters are optional. Examples. The work done in a thermodynamic cycle on an indicator diagram: = {{intorient | preintegral ...
The optional statement label or name is a string alphanumeric characters beginning in column 1. The first character has to be alphabetic. The first character has to be alphabetic. Later versions added @, #, $, and _ to the legal characters used in labels, and increased the size from the initial six, to eight characters, then to almost unlimited ...
In C# a similar syntax exist, but it is optional and it can only be applied if the member implements a single interface. Like operator for pattern comparison of strings in a much simpler way than using regular expressions. (in C# the same is available with the Microsoft.VisualBasic.CompilerServices.LikeOperator.LikeString method, but not as a ...
In certain computer programming languages, the Elvis operator, often written ?:, is a binary operator that returns the evaluated first operand if that operand evaluates to a value likened to logically true (according to a language-dependent convention, in other words, a truthy value), and otherwise returns the evaluated second operand (in which case the first operand evaluated to a value ...
Examples: AAPL7 131101C00470000. The above symbol represents a mini call option (10 shares) on AAPL, with a strike price of $470, expiring on Nov 1, 2013.