Run results for: performance of filter + map vs reduce

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

filter + map

25K/s

reduce

4K/s

View exact numbers

Test name	Executions per second
✓ filter + map	25,456 Ops/sec
reduce	3,823 Ops/sec

Script Preparation code:

a = [];
for (i = 0; i < 1000; i++) a.push(Number(i) / 1000);

filtering = (x) => (x * 114514) % 1 > 0.5;
mapping = (x) => x + 0.1919;
reducing = (acc, x) => {
	if (filtering(x)) acc.push(mapping(x));
	return acc;
};

Tests:

reduce
a.reduce(reducing, [])
filter + map
a.filter(filtering).map(mapping);