Created
January 17, 2021 12:32
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Go functions #go
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| BASIC VIEW: | |
| func name(paramerters) whatToReturn { | |
| //body | |
| return whatToReturn | |
| } | |
| ----------------------- | |
| PASSING PARAMETERS | |
| we can pass more than one argument and Go code will create slice from this arguments: | |
| func main() { | |
| sum(1, 2, 3, 4) | |
| } | |
| func sum(values ...int) { | |
| result := 0 | |
| for _, v := range values { | |
| result += v | |
| } | |
| fmt.Println(result) | |
| } | |
| but it can only be one of this and need to be passed as last argument for ex. | |
| func sum(msg string, values ...int) {} | |
| if we are passing more than one parameter but they are the same typy we can split it by comma | |
| func passing(foo, bar, baz, yzy int) //we are passing 4 parameters all are integers | |
| ----------------- | |
| RETURNIG VALUES | |
| func divide(a, b float64) (float64, error) //returnig 2 values { | |
| if b == 0.0 { | |
| return 0.0 , fmt.Errorf("cannot divide by zero") | |
| } | |
| reuturn a/b, nil | |
| } | |
| and then we need to also "take" 2 calues as return in our main function: | |
| func main(){ | |
| d , err := divide (5.0, 0.0) | |
| if err != nil{ | |
| fmt.Println(err) | |
| return | |
| } | |
| fmt.Println(d) | |
| } | |
| ----------- | |
| ANONYMOUS FUNTION | |
| we can invoke functions inside objects | |
| func(t){ | |
| body | |
| }() | |
| ----- | |
| when th epointer are passsed int, the function can change the value in the cellar | |
| funct foo() (int, error) | |
| the (result type, error) paradigm is a verry common idiom | |
| METHODS | |
| methods are special functions which return functions | |
| func (s struct) someFunction(){} | |
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