1. Function definition
The definition of the function is the same as Java, using {} for wrapping, and the parameter type and return type must be explicitly entered.
The sample code is as follows:
func min(num1, num2 int) int {
if num1 <= num2 {
return num1
} else {
return num2
}
}
func main() {
("max = %d\n", min(10, 12))
}
Execution results
max = 10
2. Return multiple values
Like Python, multiple values can be returned.
The sample code is as follows
func swap(num1, num2 int) (int, string) {
return num1 + num2, "haha"
}
func main() {
a, b := swap(10, 12)
("swap = %d - %v\n", a, b)
}
Execution results
swap = 22 - haha
3. Reference delivery
The reference address of the parameter can be passed to the function, so that the operation will affect the actual parameter.
The sample code is as follows
func swap1(num1, num2 *int) {
var temp int
temp = *num1
*num1 = *num2
*num2 = temp
}
func main() {
c, d := 10, 20
swap1(&c, &d)
("swap1 c=%d,d=%d\n", c, d)
}
Execution results
swap1 c=20,d=10
4. Functions are used as real parameters
Like python, functions can be defined inside methods.
The sample code is as follows
func method(num1 int) int {
getMax := func(x, y int) int {
if x > y {
return x
} else {
return y
}
}
a := num1 - 10
b := getMax(num1, a)
("value = %d\n", b)
return b
}
func main() {
("method = %d\n", method(20))
}
Execution results
value = 20
method = 20
5. Anonymous functions
The function returns anonymous function and forms a closure.
The sample code is as follows
//Anonymous functionfunc anonymous(num int) func() int {
var a int
a = num
return func() int {
a += 1
return a
}
}
func main() {
flagNum := anonymous(100)
("1 -> %d\n", flagNum())
("2 -> %d\n", flagNum())
("3 -> %d\n", flagNum())
flagNum1 := anonymous(18)
("4 -> %d\n", flagNum1())
("5 -> %d\n", flagNum1())
}
Execution results
1 -> 101
2 -> 102
3 -> 103
4 -> 19
5 -> 20
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