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Tricks to filter array elements in Go

You can filter array element using : as shown below
A value of 10 is assigned to the second element (index 1) and a value of 30 is assigned to the fourth element (index 3).

Example

package main

import "fmt"

func main() {
	countries := [...]string{"India", "Canada", "Japan", "Germany", "Italy"}

	fmt.Printf("Countries: %v\n", countries)

	fmt.Printf(":2 %v\n", countries[:2])

	fmt.Printf("1:3 %v\n", countries[1:3])

	fmt.Printf("2: %v\n", countries[2:])

	fmt.Printf("2:5 %v\n", countries[2:5])

	fmt.Printf("0:3 %v\n", countries[0:3])

	fmt.Printf("Last element: %v\n", countries[len(countries)-1])

	fmt.Printf("All elements: %v\n", countries[0:len(countries)])
        fmt.Println(countries[:])
	fmt.Println(countries[0:])
	fmt.Println(countries[0:len(countries)])

	fmt.Printf("Last two elements: %v\n", countries[len(countries)-2:len(countries)])
}

Output

Countries: [India Canada Japan Germany Italy]
:2 [India Canada]
1:3 [Canada Japan]
2: [Japan Germany Italy]
2:5 [Japan Germany Italy]
0:3 [India Canada Japan]
Last element: Italy
All elements: [India Canada Japan Germany Italy]
[India Canada Japan Germany Italy]
[India Canada Japan Germany Italy]
[India Canada Japan Germany Italy]
Last two elements: [Germany Italy]
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