The difference between function return values ​​in different languages ​​and Go language function return values

Difference: Go language functions always return named results, while other languages ​​usually return anonymous values. Named results: Go language functions return explicitly named results, while other languages ​​typically return anonymous values. Return value type: The Go language function signature declares the type of the result, while other languages ​​directly return the type of the result. Simplicity: The Go language's named result mechanism makes it easy to return multiple values. Readability: Naming the result improves the readability of the code because it clearly specifies the returned value.

Function return value: The difference between Go language and other languages

The function return value mechanism is different in different programming languages . This article will focus on the differences between Go language function return values ​​and those in other common languages, and provide examples through practical cases.

Return values ​​in other languages

In languages ​​such as Python, Java, and C, a function can return a value or a set of values. The type of the return value is declared by the function signature. For example, in Python:

def add_numbers(a, b):
  return a + b

This function returns the sum of two numbers.

Return Values ​​in Go

The Go language takes a different approach. Go language functions always return one or more named results. The types of these results are declared in the function signature. For example:

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

This function returns the sum of two numbers and the result is stored in the named sum result.

Practical Case

To further illustrate the difference, we create a Go program and a Python program to perform the same function: calculating the sum of two numbers.

Go program:

package main

import "fmt"

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

func main() {
  result := addNumbers(10, 20)
  fmt.Println(result)
}

Python program:

def add_numbers(a, b):
  return a + b

result = add_numbers(10, 20)
print(result)

Execution result:

Both programs will output 30.

Difference comparison

• Named results: Go language functions return named results, while other languages ​​usually return anonymous values.
• Return value type: int in the Go language function signature declares the type of the sum result, while other languages ​​directly return the type of the result (For example, a b).
• Simplicity: The Go language's named result mechanism makes it simple to return multiple values, whereas other languages ​​may require the use of tuples or dictionaries.
• Readability: Naming the result improves the readability of the code because it explicitly specifies the value returned.

Conclusion

The Go language function return value mechanism is slightly different from other programming languages. It uses named results instead of anonymous values. This difference provides the advantages of simplicity, readability, and flexibility in returning multiple values.

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