Passing of golang value type parameters

When passing value type parameters in Go, modifications to the parameters will not affect the original variables, because the parameter values ​​will be copied to the new memory location when the function is called. This works for immutable data or data that needs to be calculated within a function.

Passing value type parameters in Go

The value type is the data type stored in the stack. When the function is called, Their values ​​will be copied to a new memory location. This means that any modifications made to the function parameters will not be reflected in the original variables in the calling function.

Syntax for passing value type parameters

func functionName(paramType paramName) {
    // 函数体
}

Usage

To use value type parameters in a function, just declare Just type and variable name. For example:

func printNumber(num int) {
    fmt.Println(num)
}

Then, pass the variable when calling the function:

num := 10
printNumber(num) // 输出：10

Practical example

Consider a function that calculates the square of a number:

func square(num int) int {
    return num * num
}

func main() {
    num := 5
    result := square(num)
    fmt.Println(result) // 输出：25
    fmt.Println(num)   // 输出：5
}

In the above example, the square function takes a value type parameter num, which is an integer. When the square function is called, the value of num will be copied into the function. Modifications (square operations) to num within the function will not affect num variables outside the function.

Key Points of Passing Value Type Parameters in Go

• Modifications to value type parameters will not affect the original variables in the calling function.
• Passing value type parameters is achieved by copying the value.
• Value type parameters are often used to pass immutable data or data that needs to be calculated in a function.

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