For Loop

In programming, a loop enables us to execute a block of code repeatedly, either a fixed number of times or until a condition is met. In Go, the basic syntax of a loop is as follows:

In the initialization section, we create and initialize a new integer variable. In the condition section, we use a boolean expression that is checked during each iteration, and the loop continues to execute the code inside it as long as the condition is true. In the post section, we include a statement to be executed after every iteration.

Note

An iteration in a loop refers to each individual execution of the loop's code block. It represents a single cycle or repetition of the loop.

Here's an example of a for loop to help you better understand the concept:

index


              12345678
            
package main
import "fmt"

func main() {
   for i := 1; i < 10; i++ {
      fmt.Println(i)
   }
}

We initialized a variable i with a value of 1. In the condition, we specified i < 10, which is initially true; hence, the loop runs. After each iteration, the loop executes i++, incrementing the value of i. After nine iterations, the condition i < 10 becomes false, and the loop stops running. Here's a diagram that illustrates the loop's execution:

Using this type of loop, we can specify a fixed number of times a code will be executed. However, if we want to execute a block of code until a condition is met, we can use the following syntax:

This type of loop is commonly referred to as a "while loop" in other programming languages, as it's typically created using the while keyword. However, in Go, there is a single keyword for for creating both types of loops.

Here's a practical example of how it can be used:

index


              12345678910
            
package main
import "fmt"

func main() {
   var value float64 = 100
   for value > 0.5 {
      value = value / 2
      fmt.Println(value)
   }
}

The program above divides a number by 2 repeatedly until it becomes less than 0.5. Here's a diagram to help you better understand the execution of this loop:

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Section 3. Chapter 6