Detailed explanation of using iota case in Golang

In the Go language community, iota is often pronounced as "eye-oh-tuh". This is a simple and common way of pronunciation. Please note that this pronunciation is not official or standard, but a general convention. In different locales, there may be slightly different pronunciation methods.

In Go, iota is a predefined identifier used to generate continuous incremental values in constant declarations. The value of iota starts at 0, incrementing by 1 each time it is used in a constant declaration.

The values of iota can be read and used in the following ways:

Define a constant group and use iota to generate incremental values:

package main  
import "fmt"  
const (  
    A = iota // 0  
    B        // 1  
    C        // 2  
)  
func main() {  
    (A, B, C) // Output: 0 1 2}

In a constant group, if a constant is not assigned explicitly, it will multiplex the expression and value of the previous constant:

package main  
import "fmt"  
const (  
    X = iota // 0  
    Y        // 1  
    Z = 5    // 5  
    W        // 5  
)  
func main() {  
    (X, Y, Z, W) // Output: 0 1 5 5}

IOTA can also perform calculations and operations in expressions, such as using bit operations:

package main  
import "fmt"  
const (  
    FlagA = 1 &lt;&lt; iota // 1  
    FlagB             // 2  
    FlagC             // 4  
    FlagD             // 8  
)  
func main() {  
    (FlagA, FlagB, FlagC, FlagD) // Output: 1 2 4 8}

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