Section about computable function.
A function is a callable unit that may be called:
A function is computable if there exists an algorithm that can do the job of the function.
A function is a reusable block (section|chunk) of code written that:
Catalog and type of function that you can meet in any development language.
See also:
In real life, all functions are continuous and smooth.
The clarity of examples, and the software’s decipherability and debuggability in the real world, are likely far more important. Form must communicate function.
Functions that take many arguments are obviously bad design. Named properties can be enhanced by using method chaining and single-argument getter-setter methods.
Function property. See (Function|Operator) - Algebraic (Laws|properties) - Axioms
The concept of function is defined as a special kind of binary relation.
input -> Rule -> Output
where rule:
A function declaration has generally:
Execution of the function begins with the first statement and continues until it encounters a return statement or reaches the end of a function that has no results. Control and any results are then returned to the caller.
Aggregate functions return a single value, calculated from values in a column.
Did they return always the same result ? deterministic properties