Loops & Control Flow

🐹 Go Language Lesson 5 Beginner

Go keeps syntax clean and minimal. It features only one loop construct: the for loop, which is used to implement standard, while, and range loops.

1 The Single Loop Construct: for

Go implements all loop configurations using the `for` keyword:

Standard For Loop: `for i := 0; i < 5; i++ {}`
While Loop representation: `for condition {}` (Omit initializer and increment statements).
Infinite Loop: `for {}` (Omit all parameters).

2 Loop Control & range Traversal

Let's run a program illustrating standard loops, while loops, and using break/continue:

Go — For Loops ▶ Run Code

package main

import "fmt"

func main() {
    // 1. Standard For Loop
    fmt.Print("Standard For: ")
    for i := 1; i <= 5; i++ {
        fmt.Printf("%d ", i)
    }
    fmt.Println()

    // 2. While loop representation
    fmt.Print("While representation (skipping 3, breaking at 6): ")
    count := 1
    for count <= 10 {
        if count == 3 {
            count++
            continue; // Skip the rest of this loop iteration
        }
        if count == 6 {
            break; // Exit the loop entirely
        }
        fmt.Printf("%d ", count)
        count++
    }
    fmt.Println()
}

3 Code Challenge

Challenge: Write a loop that sums all odd numbers between 1 and 20. Skip the number 11 using the `continue` keyword, and print the computed sum at the end.