Arrays aur Slices

Ek array ka size fixed hota hai jo uske type ka hissa hota hai — [3]int aur [5]int bilkul alag types hain. Arrays Go mein exist karte hain, lekin everyday code mein inhe slices se kahin kam use kiya jaata hai.

package main

import "fmt"

func main() {
	var grid [3]int
	grid[0] = 10
	grid[1] = 20
	grid[2] = 30
	fmt.Println(grid, len(grid))
}

[10 20 30] 3

Slices: Go ka go-to collection

Ek slice ek flexible, growable view hai ek underlying array par — append() ek item add karta hai (zaroorat padne par underlying storage ko automatically grow karte hue), aur [start:end] se slicing karna aapko ek range par ek view deta hai bina data ko copy kiye.

package main

import "fmt"

func main() {
	fruits := []string{"apple", "banana", "cherry"}
	fruits = append(fruits, "date")
	fmt.Println(fruits)

	firstTwo := fruits[0:2]
	fmt.Println(firstTwo)
}

[apple banana cherry date]
[apple banana]

Aage: maps — Go ka built-in key-value collection, aur comma-ok idiom yeh check karne ke liye ki ek key exist karti hai ya nahi.