In Go language, the nil keyword is used to represent the value of a reference type when it isn't pointing to any address in memory. Here are some examples of how to check if a value is null/true/false using Go:
1. To check if a value is nil or not, you can use the ‘==’ operator. For example:
{
var pointer *int = nil
if pointer == nil {
fmt.Printf("Pointer is nil")
}
}
2. To check if a boolean value is true or false, you can simply use an if statement. For example:
{
var flag bool = true
if flag {
fmt.Printf("Flag is true")
} else {
fmt.Printf("Flag is false")
}
}
3. To check if a boolean value is false, you can use the ‘!’ operator. For example:
{
var flag bool = false
if !flag {
fmt.Printf("Flag is false")
}
}
Note that the ‘!’ operator flips the value of the boolean variable. If it was true, it becomes false, and if it was false, it becomes true.