What is it

// specified length of 5 elements
arr1 := [5]int{4,5,6,7,8}

// inferred length
arr2 := [...]int{4,5,6,7,8}

// string array
var cars = [4]string{"Volvo", "BMW", "Ford", "Mazda"}

range

The range form of the for loop iterates over a slice or map.

When ranging over a slice, two values are returned for each iteration.

The first is the index, and the second is a copy of the element at that index.

var numbers = []int{1, 2, 4, 8, 16, 32, 64, 128}

// using just the values
func main() {
  for _, v := range pow {
		fmt.Printf("%d ", v)
	}
}

// using both value and index
func main() {
	for i, v := range numbers {
		fmt.Printf("index: %d, value: % \n", i, v)
	}
}

Blank Identifier (_)

_ in index position of range is a way of declaring a variable you won't use

• it's a way of ignoring the created variable (so Go doesn't complain that you've created a varibale and not using it)

slices module

import  "slices"

things := []string{"foo", "bar", "baz"}
slices.Contains(things, "foo") // true

Byte Array

byteArr := []byte("Hello, Gophers!")