var map1 = new Map();
map1.set('a', 999);
map1.set('b', 3000);
map1.set('a', null);
map1.set('b', null);
map1.set('a', undefined);
map1.set('b', undefined);
map1.delete('a');
map1.delete('b');
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
null | |
undefined | |
delete |
Test name | Executions per second |
---|---|
null | 4272062.0 Ops/sec |
undefined | 1672979.2 Ops/sec |
delete | 4675451.5 Ops/sec |
Let's break down the provided benchmark definition and test cases to understand what is being tested.
What is being tested?
MeasureThat.net is testing the performance of different approaches when setting values in a Map
object using JavaScript. Specifically, it's checking how fast these operations are executed on various browsers.
The test creates a new Map
object called map1
, sets two key-value pairs with different values (null and undefined), deletes those keys, and then measures the execution time of each operation.
Options compared
Three options are being compared:
a
and b
to null
.a
and b
to undefined
.map1.delete('a');
and map1.delete('b');
.Pros and cons of each approach
null
. However, it may not be optimized by the JavaScript engine in some browsers.undefined
keyword instead. This approach is also straightforward and widely supported.Library used
The Map
object is a built-in JavaScript object that uses a hash table data structure to store key-value pairs. It's widely supported across modern browsers and environments.
Special JS features or syntax (None)
There are no special JavaScript features or syntaxes being tested in this benchmark.
Other alternatives
If MeasureThat.net were to add more test cases, it might consider testing other approaches, such as:
Map.set(null, null)
method instead of simply setting a key to null
.Map.set(undefined, undefined)
method instead of simply setting a key to undefined
.Keep in mind that these alternative approaches would likely be less common and may not offer significant performance benefits.