Run results for: filter-map vs reduce fixed

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1

Device Platform: Mobile

Date tested: one year ago

reduce

70K/s

map-filter

65K/s

View exact numbers

Test name	Executions per second
✓ reduce	69,772 Ops/sec
map-filter	65,058 Ops/sec

Script Preparation code:

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

Tests:

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

Run results for: filter-map vs reduce fixed

modified version of `map-filter vs reduce` that switches the order of operations Original was not fair comparison as it mapped all iterations not just the ones that passed the filter

map-filter

reduce