Go Concepts - Functions: Difference between revisions
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=Function Definition= | =Function Definition= | ||
A function is operation performed on a number of inputs resulting in a number of outputs. Same inputs will always result in the same outputs | A function is an operation performed on a number of inputs resulting in a number of outputs. Same inputs will always result in the same outputs. ''Function do not depend on a type instance's state''. | ||
=Syntax= | =Syntax= | ||
Revision as of 06:27, 22 March 2016
External
- Function type specification https://golang.org/ref/spec#Function_types
Internal
Function Definition
A function is an operation performed on a number of inputs resulting in a number of outputs. Same inputs will always result in the same outputs. Function do not depend on a type instance's state.
Syntax
func [value-receiver] <name>([parameter-identifier1] [type1], [parameter-identifier2] [type2], ...) ([return-type1], [return-type2], ...) {
statement1
statemen2
...
return <return-value1>, <return-value2>
}
Examples:
func add(a int, b int) (int) {
return a + b;
}
Built-in Functions
| make() | append() | copy() | delete() | . |
| new() | len() | cap() | . | . |
| . | . | . | . | . |
Closures
Anonymous function that capture local variables.
More about closures is available here.
Methods
A method defines the behavior of a type, and it relies on the state of an instance of the type. The method will - and it is supposed to - change the state.
A method is always exported by the package it is enclosed in.