Run results for: Reduce vs map/join

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var strings = [];
for (var i=0; i<1000; i++) {
  strings[i] = ""+i+i;
}

Tests:

for
var result = ""; for (var i=0; i<strings.length; i++) { result = result+' x-'+strings[i]; }
reduce
var result = strings.reduce(function(string, i) { return string+' x-'+i; }, ""); result=result.substring(1);
map
var result = strings.map(function(i) { return 'x-'+i; }).join(' ');
for of
var result = ""; for (var i of strings) { result += ' x-'+i; }