Run results for: filter-map vs reduce

Run details:

User agent: Mozilla/5.0 (Linux; U; Android 9; ru-ru; Redmi Note 5 Build/PKQ1.180904.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/71.0.3578.141 Mobile Safari/537.36 XiaoMi/MiuiBrowser/12.5.2-go

Browser: Chrome Mobile 71

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
map-filter	3616.6 Ops/sec
reduce	1476.4 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)=>{
  var value=mapping(x);
  if(filtering(value)) acc.push(value);
  return acc;
}

Tests:

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

Run results for: filter-map vs reduce

modified version of `map-filter vs reduce` that switches the order of operations

map-filter

reduce