Constants

Constants are similar to variables, but once declared and initialized, their value cannot be altered, which is why they are called "constants."

The syntax for declaring a constant is similar to that of a variable. However, in this case, we use the keyword const instead of var.

Note
The := operator cannot be used for declaring constants as it is reserved solely for variable declarations.

If we attempt to modify the value of constants, the compiler may produce an error, as illustrated in the following code:

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package main
import "fmt"

func main() {
    const value = 5
    value = 7 // Error expected at this line
    fmt.Println(value)
}

Constants are employed for storing values that are frequently utilized throughout the program and are intended to remain unaltered. These may include mathematical constants, configuration values, or system limits.

Effectively utilizing constants can reduce the likelihood of errors, such as modifying values that should remain constant. Additionally, it enhances code readability and comprehensibility for readers by clearly indicating which values remain constant throughout the program.

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Seção 1. Capítulo 6