Simple generator vs custom iterator

Benchmark created on

Setup

const arr = Array.from({ length: 10_000 }).map((_, i) => i)

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Testing in
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Iteratable
const result = {
	value: undefined,
	done: false
}

const elems = {
	[Symbol.iterator]() {
		let i = 0
		return {
			next() {
				result.value = arr[i]
				result.done = i++ >= arr.length
				return result
			}
		}
	}
}

for (const elem of elems) {
	
}
ready
Generator
function* fn() {
	for (let i = 0; i < arr.length; i++) {
		yield arr[i]
	}
}

const elems = fn()

for (const elem of elems) {
	
}
ready

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