Run results for: map-filter vs reduce (v2)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser: Chrome 107

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
indexMap-filter-map	6181.6 Ops/sec
reducer	38716.7 Ops/sec

Script Preparation code:


policiesList=[];
for(i=0; i<1000; i++) policiesList.push({createdBy: String(Number(i)/1000)});

var indexMap = {}
var createIndexMap = () => policiesList.forEach((policy, index) => {
  if (!indexMap[policy.createdBy]) {
    indexMap[policy.createdBy] = index;
  }
});

var filtering = (policy, index) => index === indexMap[policy.createdBy];
var mapping = policy => policy.createdBy;

var reducing= (acc, val) => acc.add(val.createdBy)

Tests:

indexMap-filter-map
createIndexMap(); policiesList.filter(filtering).map(mapping);
reducer
policiesList.reduce(reducing, new Set());

Run results for: map-filter vs reduce (v2)

indexMap-filter-map

reducer