Run results for: Reduce vs map/join

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3673.0 Safari/537.36

Browser: Chrome 73

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

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

Tests:

for in
var result = ""; for (var i in strings) { result += ' '+strings[i]; }
reduce
var result = Object.keys(strings).reduce(function(string, i) { return string+' '+strings[i]; }, "");
map
var result = Object.keys(strings).map(function(i) { return strings[i]; }).join(' ');
for of
var result = ""; for (var i of Object.values(strings)) { result += ' '+i; }
reduce vals
var result = Object.values(strings).reduce(function(string, i) { return string+' '+i; }, "");