package main import "fmt" func main() { // Classic for loop for i := 0; i < 5; i++ { fmt.Println(i) } // While-style loop x := 1 for x < 100 { x *= 2 } // Infinite loop count := 0 for { count++ if count > 10 { break // Exit loop } if count%2 == 0 { continue // Skip to next iteration } fmt.Println(count) } // Range over slice slice := []int{10, 20, 30, 40} for i, v := range slice { fmt.Printf("Index %d: %d\n", i, v) } // Range - value only for _, v := range slice { fmt.Println(v) } // Range - index only for i := range slice { fmt.Println(i) } // Range over map m := map[string]int{"a": 1, "b": 2, "c": 3} for key, value := range m { fmt.Printf("%s: %d\n", key, value) } // Range over string (runes) for i, r := range "Hello, 世界" { fmt.Printf("%d: %c\n", i, r) } // Range over channel ch := make(chan int, 3) ch <- 1 ch <- 2 ch <- 3 close(ch) for val := range ch { fmt.Println("From channel:", val) } // Nested loops for i := 0; i < 3; i++ { for j := 0; j < 3; j++ { fmt.Printf("(%d,%d) ", i, j) } fmt.Println() } // Labeled break/continue outer: for i := 0; i < 5; i++ { for j := 0; j < 5; j++ { if i*j > 6 { break outer // Break out of both loops } fmt.Printf("%d ", i*j) } fmt.Println() } // Loop with multiple variables for i, j := 0, 10; i < j; i, j = i+1, j-1 { fmt.Printf("i=%d, j=%d\n", i, j) } // Reverse iteration arr := []int{1, 2, 3, 4, 5} for i := len(arr) - 1; i >= 0; i-- { fmt.Println(arr[i]) } // Skip iterations with continue for i := 0; i < 10; i++ { if i%2 == 0 { continue // Skip even numbers } fmt.Println(i) } }

Loops

More Go tasks