Run results for: Reduce vs map/join with existing strings on an object

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 months ago

map

111K/s

reduce

103K/s

for

39K/s

for of

11K/s

View exact numbers

Script Preparation code:

var strings = [];
for (var i=0; i<1000; i++) {
  strings[i] = { name: 'test' + i };
}

Tests:

for
var result = ""; for (var i=0; i<strings.length; i++) { result = result+';;'+strings[i].name; } result=result.substring(2);
reduce
var result = strings.reduce(function(string, i) { return string+';;'+i.name; }, ""); result=result.substring(2);
map
var result = strings.map(function(i) { return i.name; }).join(';;');
for of
var result = ""; for (var i of strings) { result += ';;' + i; }