Tutorial by Topics: function

Functions in JavaScript provide organized, reusable code to perform a set of actions. Functions simplify the coding process, prevent redundant logic, and make code easier to follow. This topic describes the declaration and utilization of functions, arguments, parameters, return statements and scope ...
PHP's functional programming relies on functions. Functions in PHP provide organized, reusable code to perform a set of actions. Functions simplify the coding process, prevent redundant logic, and make code easier to follow. This topic describes the declaration and utilization of functions, argument...
Functions in Python provide organized, reusable and modular code to perform a set of specific actions. Functions simplify the coding process, prevent redundant logic, and make the code easier to follow. This topic describes the declaration and utilization of functions in Python. Python has many bui...
Function pointers are pointers that point to functions instead of data types. They can be used to allow variability in the function that is to be called, at run-time. returnType (*name)(parameters) typedef returnType (*name)(parameters) typedef returnType Name(parameters); Name *n...
map(function, iterable[, *additional_iterables]) future_builtins.map(function, iterable[, *additional_iterables]) itertools.imap(function, iterable[, *additional_iterables]) ParameterDetailsfunctionfunction for mapping (must take as many parameters as there are iterables) (positional-only)...
Functions in Go provide organized, reusable code to perform a set of actions. Functions simplify the coding process, prevent redundant logic, and make code easier to follow. This topic describes the declaration and utilization of functions, arguments, parameters, return statements and scopes in Go. ...
Define a function with the function keyword: function f { } Define a function with (): f(){ } Define a function with both the function keyword and (): function f(){ }
Scala has first-class functions. Difference between functions and methods: A function is not a method in Scala: functions are a value, and may be assigned as such. Methods (created using def), on the other hand, must belong to a class, trait or object. Functions are compiled to a class exte...
There are many situations where it is useful to return several values from a function: for example, if you want to input an item and return the price and number in stock, this functionality could be useful. There are many ways to do this in C++, and most involve the STL. However, if you wish to avoi...
See also separate topic on Overload Resolution Ambiguities can occur when one type can be implicitly converted into more than one type and there is no matching function for that specific type. For example: void foo(double, double); void foo(long, long); //Call foo with 2 ints foo(1, 2);...
As more secure web services avoid storing passwords in plain text format, languages such as PHP provide various (undecryptable) hash functions to support the more secure industry standard. This topic provides documentation for proper hashing with PHP. string password_hash ( string $password , ...
ParameterDetailscharacter_expressionthe existing string in your datastart_positionthe position in character_expression to delete length and then insert the replacement_stringlengththe number of characters to delete from character_expressionreplacement_stringthe sequence of characters to insert in c...
async and await build on top of promises and generators to express asynchronous actions inline. This makes asynchronous or callback code much easier to maintain. Functions with the async keyword return a Promise, and can be called with that syntax. Inside an async function the await keyword can be...
Function([DISTINCT] expression) -DISTINCT is an optional parameter AVG ( [ ALL | DISTINCT ] expression ) COUNT( { [ALL | DISTINCT ] expression ] | * } ) GROUPING(<column_expression>) MAX ( [ ALL | DISTINCT ] expression ) MIN ( [ ALL | DISTINCT ] expression ) SUM ( [ ALL | DISTINCT ] e...
In C, it is common to use return values to denote errors that occur; and to return data through the use of passed in pointers. This can be done for multiple reasons; including not having to allocate memory on the heap or using static allocation at the point where the function is called.
Function functionName(argumentVariable As dataType, argumentVariable2 As dataType, Optional argumentVariable3 As dataType) As functionReturnDataType Basic declaration of a function. Every function needs a name, but it does not have to take any arguments. It may take 0 arguments, or it may take ...
Functions and subroutines, in conjunction with modules, are the tools to break down a program into units. This makes the program more readable and manageable. Each one of these units can be thought of as part of the code that, ideally, could be compiled and tested in isolation. The main program(s...

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