Keywords in Go
Keyword - Keywords are words in a language that are used for some internal processes or represent some predefined actions. Here is what you need to know about keywords in Golang.
Switch Statement in Go
Golang like most other programming languages has the switch statement . The switch statement in Golang allows you to evaluate a variable or expression in multiple cases and is often used when writing multiple if-else statements makes the code look ugly and repetitive.
In Go, a switch statement is a multi-directional branching statement that effectively directs execution based on the value (or type) of an expression. There are two main types of switch statements in Go :
- Expression Switch
- Type Switch
For example:
package main
import "fmt"
func main() {
day := 4
switch day {
case 1:
fmt.Println("Monday")
case 2:
fmt.Println("Tuesday")
case 3:
fmt.Println("Wednesday")
case 4:
fmt.Println("Thursday")
case 5:
fmt.Println("Friday")
default:
fmt.Println("Invalid day")
}
}Switch statement syntax in Golang
switch optstatement; optexpression {
case expression1:
// Khối code
case expression2: # Expression Switch
// Khối code
default:
// Khối code
}
switch var := interfaceValue.(type) {
case type1:
// Khối code
case type2: # Type Switch
// Khối code
default:
// Khối code
}Expression Switch
Expression Switch evaluates an expression and switches to a case based on the value of that expression. If no expression is provided, switch defaults to true .
Syntax
switch optstatement; optexpression {
case expression1:
// Khối code
case expression2:
// Khối code
default:
// Khối code
}optstatement: Optional statement (e.g. variable declaration).
optexpression: Optional expression (if omitted, defaults to true ).
Example with optional command
Here we introduce an optional statement that declares a variable day . The switch statement then evaluates day under various cases.
package main
import "fmt"
func main() {
switch day := 4; day {
case 1:
fmt.Println("Monday")
case 2:
fmt.Println("Tuesday")
case 3:
fmt.Println("Wednesday")
case 4:
fmt.Println("Thursday")
case 5:
fmt.Println("Friday")
default:
fmt.Println("Invalid day")
}
}
Result:
ThursdayExample with optional Expression
If no expression is specified, the switch statement in Golang will assume the expression is true. This allows us to use boolean conditions in case statements.
package main
import "fmt"
func main() {
day := 4
switch {
case day == 1:
fmt.Println("Monday")
case day == 4:
fmt.Println("Thursday")
case day > 5:
fmt.Println("Weekend")
default:
fmt.Println("Invalid day")
}
}
Result
ThursdayType Switch
Type Switch is used to branch on the type of an interface value, rather than its value. This is especially useful when dealing with variables of unknown type.
Syntax
switch var := interfaceValue.(type) {
case type1:
// Khối code
case type2:
// Khối code
default:
// Khối code
}For example:
This example uses the same day variable but wrapped in interface{} to illustrate type casting.
package main
import "fmt"
func main() {
var day interface{} = 4
switch v := day.(type) {
case int:
switch v {
case 1:
fmt.Println("Monday")
case 2:
fmt.Println("Tuesday")
case 3:
fmt.Println("Wednesday")
case 4:
fmt.Println("Thursday")
case 5:
fmt.Println("Friday")
default:
fmt.Println("Invalid day")
}
default:
fmt.Printf("Unknown type: %T\n", v)
}
}
Result:
ThursdayData types in Golang
Data types specify what type of data a valid Go variable can hold. In the Go language, types are divided into four categories as follows:
Function arguments in Golang
Go supports two main ways to pass arguments: Pass by Value and Pass by Reference. Go uses pass by value by default.
Function returning multiple values in Golang
In Go language, you are allowed to return multiple values from a function, using the return statement. In other words, in a function, a return statement can return multiple values.
Cases to know when using selection statements in Golang
In this article, we will learn how to use default case to avoid deadlock. But first, we will learn what is deadlock case when using select command in Golang?
Anonymous structures and fields in Golang
Anonymous structs in Golang are temporary structures with no names used for one-time purposes, while anonymous fields allow embedding of unnamed fields.
How to use Rune in Golang
What is Rune in Golang? How to use Rune in Golang? This article will give you the answer.
How to use operators in Golang
Operators allow us to perform different types of operations on operands. In Go language, operators can be classified based on their different functions.
Void identifier in Golang
_(underscore) in Golang is called Blank Identifier. Identifier is a user-defined name of program elements used for identification purposes.
How to create basic program in Golang
Hello, World! is the first basic program in any programming language. You can write this first program in Golang by following the steps below.
How to Install Go on Windows
Golang can be easily installed on Windows. Here is a step-by-step guide to install Golang on Windows.
Methods with the same name in Golang
Golang allows creating two or more methods with the same name in the same package, but the receivers of these methods must be of different types.
Functions in Go
In Go, functions are blocks of code that perform specific tasks, which can be reused throughout the program to save memory, improve readability, and save time.
Variable Scope in Go
The scope of a variable in Golang determines which part of the program the variable is accessible to. In Go, all identifiers have a lexical scope that is determined at compile time.
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