<script>
function randomString()
{
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    for( var i=0; i < 5; i++ )
        text += possible.charAt(Math.floor(Math.random() * possible.length));

    return text;
}
function rand(min, max) {
    return Math.random() * (max - min) + min;
}
</script>

Setup JS

var map2 = new Map();
    var obj2 = {};
    
    for (var i=0; i < 250000; i++) {
       var key = i;
       var val = randomString();
       map2.set(key,val);
       obj2[key] = val;
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   map2.set(key,val);
}

Test #2

Title *

Async

Code *

for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   obj2[key] = val;
}

Test #3

Title *

Async

Code *

for (var i=0; i < 1000; i++) {
   var a = map2.get(rand(0, 249999));
}

Test #4

Title *

Async

Code *

for (var i=0; i < 1000; i++) {
   var a = obj2[rand(0, 249999)];
}

Test case details

Preparation Code

Test cases

Test #1

Test #2

Test #3

Test #4