Foreach Loop in Go

Go does not have a traditional foreach loop like some other programming languages. Instead, it uses a range-based iteration method to loop over elements in collections such as arrays, slices, maps, and strings.

Iterating Over Arrays and Slices

To iterate over elements in an array or slice, you can use the range keyword followed by the array or slice variable. The range keyword returns the index and the value of each element in the collection.

Example

package main

import "fmt"

func main() {
    numbers := []int{1, 2, 3, 4, 5}

    for index, value := range numbers {
        fmt.Printf("Index: %d, Value: %d\n", index, value)
    }
}

Iterating Over Maps

For maps, the range keyword iterates over key-value pairs in the map. The range keyword returns the key and the value of each key-value pair.

Example

package main

import "fmt"

func main() {
    fruits := map[string]int{
        "apple":  1,
        "banana": 2,
        "orange": 3,
    }

    for key, value := range fruits {
        fmt.Printf("Key: %s, Value: %d\n", key, value)
    }
}

Ignoring the Index or Key

If you are not interested in the index or key, you can use the blank identifier (_) to ignore them during iteration.

Example

package main

import "fmt"

func main() {
    colors := []string{"red", "green", "blue"}

    for _, color := range colors {
        fmt.Println("Color:", color)
    }
}