For Loop

A for loop is a control flow statement for specifying iteration, which allows code to be executed repeatedly.

Code example

package main
 
import "fmt"
 
func main() {
	// Simple loop
	count := 10
	for i := 0; i < count; i++ {
		fmt.Println(i)
	}
 
	// Infinite loop (Commented out to prevent infinite execution)
	// for {
	// 	fmt.Println("Infinite loop")
	// }
 
	// Loop with range - Corrected Example
	fmt.Println("\nLoop with Range over a Slice:")
	numbers := []int{1, 2, 3}
	for j := range numbers {
		fmt.Println(j)
	}
 
	// Loop with range - Iterating over the values in a slice
	fmt.Println("\nLoop with Range and Values:")
	for index, value := range numbers {
		fmt.Printf("Index: %d, Value: %d\n", index, value)
	}
}

Output

0
1
2
3
4
5
6
7
8
9
 
Loop with Range over a Slice:
0
1
2
 
Loop with Range and Values:
Index: 0, Value: 1
Index: 1, Value: 2
Index: 2, Value: 3

Explanation

Simple Loop

count := 10
for i := 0; i < count; i++ {
fmt.Println(i)
}

Initializes a loop that iterates from 0 to count-1 (i.e., 0 to 9).
Prints the value of i in each iteration.

Infinite Loop (Commented Out)

// Infinite loop (Commented out to prevent infinite execution)
for {
fmt.Println("Infinite loop")
}

It is commented out to avoid an infinite execution that would hang the program.

Loop with range Over a Slice

fmt.Println("\nLoop with Range over a Slice:")
numbers := []int{1, 2, 3}
for j := range numbers {
fmt.Println(j)
}

Declares a slice numbers with elements [1, 2, 3].
Iterates over the indices of the slice using range.
Prints each index j of the slice.

Loop with range - Iterating Over Values:

fmt.Println("\nLoop with Range and Values:")
for index, value := range numbers {
fmt.Printf("Index: %d, Value: %d\n", index, value)
}

Uses range to iterate over both indices and values of the slice.
Prints both the index and the corresponding value for each element in the slice.

03. Variables 05. If Else