GoLang Array len()

In this tutorial, we will learn how to find the length of the given array using in-built method along with working examples of it.

In the Go language, len() is used to return the length of the array. It takes array name as a parameter and return the total number of elements present in the given array.

Array len()

Syntax:

len(array_name)

It accepts array_name as the parameter.

Example 1:

Let us create an array with integer type that holds 5 values and return the length.

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package main
import ("fmt")

func main() {
    // Decalre an array that hold 5 integers
   first := [5]int{34,56,43,22,21}
    
 fmt.Println("Actual Array: ",first)
 
 // Return the length
 fmt.Println("Length: ",len(first))
 
}

Output:

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Actual Array:  [34 56 43 22 21]
Length:  5

Explanation for the above output:

The length is 5, because there are totally 5 elements in the array.

Example 2:

Let us create an array of with integer type that holds 2 integers and return length.

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package main
import ("fmt")

func main() {
    // Decalre an array that hold integers of length-5
   first := [5]int{1:34,4:56}
   
    fmt.Println("Actual Array: ",first)
 
 // Return the length
  fmt.Println("Length: ",len(first))
}

Output:

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Actual Array:  [0 34 0 0 56]
Length:  5

Explanation for the above output:

As the last element index is 4. The length will be equal to the index+1 of the last element.

Example 3:

Let us create an array with string type that holds 2 strings and return length.

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package main
import ("fmt")

func main() {
    // Decalre an array that hold strings
   first := []string{1:"Hello",2:"gkindex"}
   
    fmt.Println("Actual Array: ",first)
 
 // Return the length
  fmt.Println("Length: ",len(first))
}

Output:

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Actual Array:  [ Hello gkindex]
Length:  3

As the last element index is 2. The length will be equal to the index+1 of the last element.

Conclusion:

Now we know how to return total number of elements in a Golang Array using len() function and understood the implementation with working examples.