Run results for: filter-map vs reduce, fixed.

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.27 Safari/537.36

Browser: Chrome 96

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
map-filter	39927.4 Ops/sec
reduce	59824.3 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;
}

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

Run results for: filter-map vs reduce, fixed.

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

map-filter

reduce