Run results for: Map vs Object test with unicode

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:57.0) Gecko/20100101 Firefox/57.0

Browser: Firefox 57

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Map	601994.0 Ops/sec
Object	890429.8 Ops/sec

Script Preparation code:

var N_TRIES = 5000000;
    var GENDER_FEMALE = 0;
    var GENDER_MALE = 1;
    var obj = {
        '\u{1f937}': GENDER_FEMALE,
        '\u{1f938}': GENDER_MALE,
        '\u{1f939}': GENDER_MALE,
        '\u{1f6a3}': GENDER_MALE,
        '\u{1f575}': GENDER_MALE,
        '\u{1f646}': GENDER_FEMALE,
        '\u{1f647}': GENDER_MALE,
        '\u{1f645}': GENDER_FEMALE,
        '\u{1f46f}': GENDER_FEMALE,
        '\u{1f46e}': GENDER_MALE,
        '\u{1f926}': GENDER_MALE,
        '\u{1f471}': GENDER_MALE,
        '\u{1f9d8}': GENDER_FEMALE,
        '\u{1f473}': GENDER_MALE,
        '\u{1f6b6}': GENDER_MALE,
        '\u{1f477}': GENDER_MALE,
        '\u{1f9de}': GENDER_FEMALE,
        '\u{1f3c4}': GENDER_MALE,
        '\u{1f3c3}': GENDER_MALE,
        '\u{1f9d7}': GENDER_FEMALE,
        '\u{1f9d6}': GENDER_MALE,
        '\u{26f9}': GENDER_MALE,
        '\u{1f9df}': GENDER_FEMALE,
        '\u{1f481}': GENDER_FEMALE,
        '\u{1f482}': GENDER_MALE,
        '\u{1f6b4}': GENDER_MALE,
        '\u{1f6b5}': GENDER_MALE,
        '\u{1f486}': GENDER_FEMALE,
        '\u{1f487}': GENDER_FEMALE,
        '\u{1f9dd}': GENDER_MALE,
        '\u{1f9da}': GENDER_FEMALE,
        '\u{1f9dc}': GENDER_FEMALE,
        '\u{1f9db}': GENDER_FEMALE,
        '\u{1f3cb}': GENDER_MALE,
        '\u{1f3cc}': GENDER_MALE,
        '\u{1f3ca}': GENDER_MALE,
        '\u{1f64d}': GENDER_FEMALE,
        '\u{1f64e}': GENDER_FEMALE,
        '\u{1f64b}': GENDER_FEMALE,
        '\u{1f9d9}': GENDER_FEMALE,
        '\u{1f93c}': GENDER_MALE,
        '\u{1f93d}': GENDER_MALE,
        '\u{1f93e}': GENDER_FEMALE,
    };
    var map = new Map(Object.entries(obj));
    var elems = Object.keys(obj);

Tests:

Map
for (let j = 0; j < elems.length; ++j) { map.get(elems[j]); }
Object
for (let j = 0; j < elems.length; ++j) { obj[elems[j]]; }