The Foreach Loop in Golang

1. Use the slice Function to Implement a foreach Loop in Golang
2. Use the map Function to Implement a foreach Loop in Golang

This article will show various examples of implementing a foreach loop using a function in the Go programming language and a brief discussion about Golang and the used functions.

Use the slice Function to Implement a foreach Loop in Golang

The foreach keyword does not exist in Go; nevertheless, the for loop can be extended to achieve the same thing.

The distinction is that the range keyword is used with a for loop. You can use the slices key or value within the loop, much like in many other languages foreach loops.

Example 1:

package main

//import fmt package
import (
	"fmt"
)

//program execution starts here
func main() {

	//declare and initialize slice
	fruits := []string{"mango", "grapes", "banana", "apple"}

	//traverse through the slice using for and range
	for _, element := range fruits {

		//Print each element in new line
		fmt.Println(element)
	}
}

Output:

mango
grapes
banana
apple

We traverse through a slice of fruit in the example above. After that, we use for-range to print each element on a new line.

Example 2:

We print each word by iterating over a string slice in this example. We use an underscore _ instead of a key since we require the value.

package main

import "fmt"

func main() {

	myList := []string{"rabbit", "dog", "parrot"}

	// for {key}, {value} := range {list}
	for _, animal := range myList {
		fmt.Println("My animal is:", animal)
	}
}

Output:

My animal is: rabbit
My animal is: dog
My animal is: parrot

Use the map Function to Implement a foreach Loop in Golang

An array can iterate and loop over each element in a map. Golang Maps is a group of key-value pairs that aren’t sorted in any way.

It’s widely used for quick lookups and values that can be retrieved, updated, or deleted using keys.

Example:

package main

import "fmt"

func main() {

	myList := map[string]string{
		"dog":      "woof",
		"cat":      "meow",
		"hedgehog": "sniff",
	}

	for animal, noise := range myList {
		fmt.Println("The", animal, "went", noise)
	}
}

Output:

The cat went meow
The hedgehog went sniff
The dog went woof