How to create golang function?

Steps to create a function in Go: Use the func keyword to declare the function name, which must start with a lowercase letter. Specify the function's parameter list in parentheses, each parameter having its type. Write the function body within curly braces to specify the function's behavior. Use the return keyword to return the type of the function, which can be any built-in type or a custom type.

#How to create a Go function?

Creating functions in Go is easy. Use the following syntax:

func function_name(parameters) return_type {
  // 函数体
}

• function_name: The name of the function, must start with a lowercase letter.
• parameters: The parameter list passed into the function, each parameter has a type.
• return_type: The type returned by the function, which can be any built-in type or custom type.

Practical case: summation function

The following is an example of a function that calculates the sum of two numbers:

func sum(a int, b int) int {
  return a + b
}

We can use the following method Calling a function:

result := sum(10, 20)
fmt.Println(result) // 输出：30

Function type

The Go language supports function types. This means we can pass functions as arguments to other functions or store them in variables. A function type is declared like this:

type function_type = func(parameters) return_type

For example, we can declare a function type and use it to create functions:

type SumFunc = func(a int, b int) int

func createSumFunc() SumFunc {
  return func(a int, b int) int {
    return a + b
  }
}

Then we can use the function type like this:

sumFunc := createSumFunc()
result := sumFunc(10, 20)
fmt.Println(result) // 输出：30

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