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Go language function as a value and the use of function closures, I believe that many inexperienced people are helpless, for this reason this article summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

function as value

The Go programming language provides flexibility to dynamically create functions and use their values. In the example below, we have variables defined with initialization functions. The purpose of this function variable is only to use the built-in Math.sqrt() function. Here is an example:

The copy code is as follows:

package main

import (

"fmt"

"math"

)

func main(){

/* declare a function variable */

getSquareRoot := func(x float64) float64 {

return math.Sqrt(x)

}

/* use the function */

fmt.Println(getSquareRoot(9))

}

When the above code is compiled and executed, it produces the following results:

3

function closures

The Go programming language supports anonymous functions which can be closed as functions. When we want to define a function inline without passing any name, it can use anonymous functions. In our example, we created a function getSequence() that will return another function. The purpose of this function is to close the variable i of the upper function to form a closure. Here is an example:

The copy code is as follows:

package main

import "fmt"

func getSequence() func() int {

i:=0

return func() int {

i+=1

return i

}

}

func main(){

/* nextNumber is now a function with i as 0 */

nextNumber := getSequence()

/* invoke nextNumber to increase i by 1 and return the same */

fmt.Println(nextNumber())

fmt.Println(nextNumber())

fmt.Println(nextNumber())

/* create a new sequence and see the result, i is 0 again*/

nextNumber1 := getSequence()

fmt.Println(nextNumber1())

fmt.Println(nextNumber1())

}

When the above code is compiled and executed, it produces the following results:

12312 After reading the above, do you know how to use functions as values and function closures in Go? If you still want to learn more skills or want to know more related content, welcome to pay attention to the industry information channel, thank you for reading!

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