Common types of golang function return values

Common return value types of Go functions include: basic types (bool, number, string) composite types (arrays, slices, maps, structures). In actual cases, a Boolean value is returned to indicate whether the user is an adult. Other types (channels, generators Function) When choosing a return value type, consider the purpose of the function, the amount of information in the return value, and the interaction with the calling code.

Common types of Go function return values

In the Go language, functions can return various data types. The following are a few A common type:

Basic type

• Boolean value (bool): represents true (true) or false (false)
• Integers (int, int8, int16, int32, int64): Represents integers
• Floating point numbers (float32, float64): Represents decimals
• String (string): Represents text
• Byte array ([]byte): Represents binary data

Composite type

• Array ([]T): A collection of a set of elements of the specified type T
• Slice([]T): Similar to array, but with variable length
• Map(map[K]V): Map keys (K) to values ​​(V) Collection
• Structure(struct): Contains custom data types with multiple fields of different types

Practical case

Here is an example function that gets the user's age and returns a Boolean value to indicate whether the user is an adult (over 18 years old):

func isAdult(age int) bool {
    return age >= 18
}

Examples of common return types

• Login function: Returns a Boolean value indicating whether the login is successful
• Find function: Returns the found element or a nil value representing not found
• Parse function: Parse the string into a structure and return the parsed structure or error
• Generation function: Return a generator function , this function generates a sequence of elements of the specified type
• Channel:Returns a channel for inter-process communication

Design considerations

When choosing a return value type, consider the following factors:

• The purpose of the function
• The information carried by the return value
• The relationship between the calling code and interactive mode

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