array in golang

var arr1 [3]int //ARRAY syntax#1 arr2 := [2]string{"Hello", "World"} //ARRAY syntax#2 (composite literal)(identifier:= type{values}) arr3 := [...]int{12, 13, 14, 15, 16} //ARRAY syntax#3 arr4 := [5][2]int{{0, 0}, {1, 2}, {2, 4}, {3, 6}, {4, 8}} //ARRAY syntax#4 var arr5 [4][3]int //ARRAY syntax#4.1 arr5[0] = [3]int{1, 2, 3} arr5[1] = [3]int{4, 5, 6} arr5[2] = [3]int{7, 8, 9} fmt.Println(arr1, arr2, arr3, arr4, arr5)

var a [10]int // declare an int array with length 10. Array length is part of the type! a[3] = 42 // set elements i := a[3] // read elements // declare and initialize var a = [2]int{1, 2} a := [2]int{1, 2} //shorthand a := [...]int{1, 2} // elipsis -> Compiler figures out array length

package main import "fmt" func main() { var x [5]int // An array of 5 integers x[0] = 100 x[1] = 101 x[3] = 103 x[4] = 105 fmt.Printf("x[0] = %d, x[1] = %d, x[2] = %d\n", x[0], x[1], x[2]) fmt.Println("x = ", x) }

golang array

package main

import (
	"fmt"
)

func main() {

	// array with not range maximal capacity
	arrayNotMax := [...]int{1991, 1992, 1993, 1994, 1995}

	// array with range maximal capacity
	var arrayMax [3]int
	arrayMax[0] = 1990
	arrayMax[1] = 1991
	arrayMax[2] = 1992

	// array using make method
	var arrayWithMake = make([]string, 3)
	arrayWithMake[0] = "zero"
	arrayWithMake[1] = "one"
	arrayWithMake[2] = "two"

	// array multi dimension
	var arrayMultiDimension = [2][5]int{{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}}

	fmt.Printf("read arrayNotMax value %#v \n", arrayNotMax)
	fmt.Printf("read arrayMax value %#v \n", arrayMax)
	fmt.Printf("read arrayWithMake value %#v \n", arrayWithMake)
	fmt.Println("read length of array", len(arrayNotMax))
	fmt.Println("read capacity of array", cap(arrayNotMax))
	fmt.Println("read arrayMultiDimension value", arrayMultiDimension)

}

Posted by: Guest on March-09-2021

// Sum function takes a pointer of array with 3 float numbers. if you define `a *[4]float64` then you get type error func Sum(a *[3]float64) (sum float64) { for _, v := range *a { sum += v } return } array := [...]float64{7.0, 8.5, 9.1} x := Sum(&array) // Note the explicit address-of operator /* ## Array in Golang 1. There are major differences between the ways arrays work in Go and C. In Go: - Arrays are values. Assigning one array to another copies all the elements. - In particular, if you pass an array to a function, it will receive a copy of the array, not a pointer to it. - The size of an array is part of its type. The types [10]int and [20]int are distinct. 2. The value property can be useful but also expensive; if you want C-like behavior and efficiency, you can pass a pointer to the array. */

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