How to enable return value type inference in Go language

Go 1.18 introduces type inference, which automatically infers variable types through the compiler, which can significantly improve code readability and simplicity: Enable type inference: Add the -trimpath flag in the Go file. There is no need to specify the variable type explicitly: the variable value will automatically infer its type. Simplify code: Reduce redundant type declarations and simplify code. Reduce errors: Automatically inferring types reduces the chance of errors when manually specifying types.

Type Inference in Go: Empowering Go Code

Introduction

The Go language is a popular programming language widely praised for its elegant syntax and convenient features. In the Go 1.18 version, the return value type inference function was introduced, which greatly enhanced the readability and simplicity of Go code.

Type inference

Type inference, as the name suggests, refers to automatically inferring the type of a variable based on its value. Prior to Go 1.18, developers were required to explicitly specify the types of all variables. Now, you can simplify this process by enabling type inference.

Enable type inference

To enable type inference, you need to add the -trimpath tag to your Go code file:

package main

import "fmt"

func main() {
    // 启用类型推断
    fmt.Println("Hello, world!")
}

Practical case

Before, you needed to explicitly specify the slice type when creating a slice:

type mySlice []int
var slice mySlice = []int{1, 2, 3}

After using type inference, it can be simplified to:

var slice = []int{1, 2, 3}

The compiler will automatically infer that the type of slice is []int.

When returning a variable in a function, type inference can also be enabled:

func getVal() int {
    return 10
}

Advantages

Type inference has the following advantages:

• Improve code readability: No need to explicitly specify the types of many variables.
• Simplify code: Make the code more concise by reducing redundant type declarations.
• Reduce errors: By automatically inferring types, you can reduce errors that may occur when manually specifying types.

Note:

Although type inference is a useful feature, it should still be used wisely. Sometimes specifying the type explicitly can provide additional clarity and type safety.

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