Benchmark: finIndex in map vs. lookup + map

Script Preparation code:

var arr1 = [];
var arr2 = [];
var i = 0;
var j = 0;

while (i <= 1E5) {
  arr1[i] = i++;
  arr2[j] = j++;
}

Tests:

map + findIndex
arr1.map((item1) => (arr2.findIndex(item2 => item2 === item1)));
lookup + map
const lookup = arr2.reduce((lookup, item, index) => (lookup[item] = index), {}); arr2.map((item) => lookup[item]);

Rendered benchmark preparation results:

Previous results

Test case name	Result
map + findIndex
lookup + map

Latest run results:

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finIndex in map vs. lookup + map (version: 0)