Super quick and very dirty memory benchmark of Immutable JS.

benchmark.coffee

heapdump = require "heapdump"
Immutable = require "immutable"

pixels = 256 * 256
iterations = 1000

# Immutable
testImmutable = ->
	# Simulate a pixel grid
	grid = Immutable.Vector()
	
	for [0...pixels]
		grid = grid.push 0

	history = Immutable.Vector grid

	for i in [0...iterations]
		grid = grid.set Math.round(Math.random() * pixels), Math.round(Math.random() * 16777215) # FFFFFF
		history = history.push grid

	if process.env.HEAP_DUMP?.toString() is "true"
		heapdump.writeSnapshot()

# Vanilla Morph
testVanillaMorph = ->
	grid = for [0...pixels]
		0

	for i in [0...iterations]
		index = Math.round(Math.random() * pixels)
		value = Math.round(Math.random() * 16777215) # FFFFFF
		grid[index] = value

	if process.env.HEAP_DUMP?.toString() is "true"
		heapdump.writeSnapshot()

# Vanilla Immutable
testVanillaImmutable = ->
	grid = for [0...pixels]
		0

	history = [grid]

	for i in [0...iterations]
		index = Math.round(Math.random() * pixels)
		value = Math.round(Math.random() * 16777215) # FFFFFF
		grid[index] = value
		history.push grid.slice()

	if process.env.HEAP_DUMP?.toString() is "true"
		heapdump.writeSnapshot()

# Vanilla Diff
testVanillaDiff = ->
	grid = for [0...pixels]
		0

	history = [grid]

	for i in [0...iterations]
		index = Math.round(Math.random() * pixels)
		value = Math.round(Math.random() * 16777215) # FFFFFF
		grid[index] = value
		history.push index: index, value: value

	if process.env.HEAP_DUMP?.toString() is "true"
		heapdump.writeSnapshot()

if process.env.VANILLA_MORPH?.toString() is "true"
	testVanillaMorph()

if process.env.VANILLA_IMMUTABLE?.toString() is "true"
	testVanillaImmutable()

if process.env.VANILLA_DIFF?.toString() is "true"
	testVanillaDiff()

if process.env.IMMUTABLE?.toString() is "true"
	testImmutable()

module.exports = immutable: testImmutable, vanillaDiff: testVanillaDiff, vanillaImmutable: testVanillaImmutable