Function signatures and type inference in Go language

1. Function signature

Function is an important way to encapsulate code in programming. Functions provide a way to encapsulate a block of code and reuse it when needed. In Go, functions are first-class values ​​that can be passed to and returned from functions just like other types of values.

The function signature describes the input and output of the function, including the number, type, and return value type of parameters. The syntax of function signature in Go language is as follows:

func functionName(parameter1 type1, parameter2 type2) (returnType1, returnType2) {
    // 函数体
}

Among them, functionName is the name of the function, parameter1, parameter2, etc. are functions Parameters, types are type1, type2, etc., separated by commas. A function can have multiple parameters, but the type of each parameter must be determined.

When a function returns multiple values, the return value types must also be separated by commas. If the function only returns a value, the return type can be omitted.

For example, the following code defines a function named add that accepts two parameters a and b and returns their sum ：

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

2. Type inference

In Go language, variable declaration can use := for type inference. This method can make programming more efficient. concise.

For example, the following code shows how to declare and initialize an integer variable x:

x := 10

In this example, we did not specify the type of x . The Go compiler will automatically infer that the type of x is int based on the type of the expression on the right. Therefore, using type inference can omit the declaration statement of the variable type, making the code more concise.

In function calls, type inference can make function parameters more concise. For example, the following code demonstrates how to use type inference to call the add function:

sum := add(3, 5)

Since the parameter type of the add function is already specified as ## in the function signature #int type, so there is no need to declare the parameter type again. The compiler can automatically infer the parameter type based on the supplied value.

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