Odin by Example: Dynamic arrays

Dynamic arrays are resizable collections. Unlike arrays, they can grow and shrink as elements are added or removed.

The built-in append procedure adds one or more elements to the end of a dynamic array.

The built-in len procedure returns the number of elements, while cap returns the current capacity.

$ odin run dynamic_arrays.odin -file
[]
[10 20 30]
len: 3
cap: 8
[10 20]

package main

import "core:fmt"

main :: proc() {
	// Declare an empty dynamic array.
	numbers: [dynamic]int

	fmt.println(numbers)

	// Append elements.
	append(&numbers, 10)
	append(&numbers, 20, 30)

	fmt.println(numbers)

	// len returns the number of elements.
	fmt.println("len:", len(numbers))

	// cap returns the current capacity.
	fmt.println("cap:", cap(numbers))

	// Remove the last element.
	pop(&numbers)

	fmt.println(numbers)
}

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