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Golang program to find the length of a slice

Here, we are going to learn how to find the length of a slice in Golang (Go Language)?
Submitted by Nidhi, on March 15, 2021 [Last updated : March 04, 2023]

How to find the length of a slice in Golang?

Problem Solution:

In this program, we will create a slice from an integer array and find the length of the slice using the len() function.

Program/Source Code:

The source code to find the length of a slice is given below. The given program is compiled and executed successfully.

Golang code to find the length of a slice

// Golang program to find the length of a slice

package main

import "fmt"

func main() {
	//Create an integer array
	arr := [10]int{10, 20, 30, 40, 50, 60, 70, 80, 90, 100}

	//create slice of from index 2 till index 4(5-1).
	intSlice := arr[2:5]

	fmt.Println("Integer slice: ", intSlice)
	fmt.Println("Length of slice: ", len(intSlice))
}

Output:

Integer slice:  [30 40 50]
Length of slice:  3

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt package that includes the files of package fmt then we can use a function related to the fmt package.

In the main() function, we created an array of integers with 10 elements. Then we created a slice from index 2 to 4.  After that, we calculated the length of the slice and print the result on the console screen.

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