Block passing is a technique used in Go to pass a block of instructions as a parameter to a function. This can be useful when you need to execute a set of instructions within a function, but you don't want to repeat that set of instructions each time the function is called.
Here is an example of how to use block passing in Go:
package main
import "fmt"
func main() {
executeBlock(func() {
fmt.Println("Executing block...")
})
}
func executeBlock(block func()) {
fmt.Println("Beginning execution...")
block()
fmt.Println("Ending execution...")
}
In this example, we define a function called executeBlock that takes one parameter, a function called block that has no parameters and no return value.
In the main function, we call executeBlock and pass it a "block" of instructions as a parameter. The block is defined as an anonymous function that prints "Executing block..." to the console.
When executeBlock is called, it first prints "Beginning execution...", then it calls the block that was passed as a parameter. The block executes, printing "Executing block..." to the console. Finally, executeBlock prints "Ending execution..." to the console.
The output of this code will be:
Beginning execution...
Executing block...
Ending execution...
This example demonstrates how block passing can be used to execute a set of instructions within a function without having to repeat that set of instructions each time the function is called.