var a = "/1231231"
var b = "121312321"
console.log(/^\//.test(a));
console.log(/^\//.test(b));
console.log(a.startsWith("/"))
console.log(b.startsWith("/"))
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
regex | |
noregex |
Test name | Executions per second |
---|---|
regex | 40951.0 Ops/sec |
noregex | 41718.7 Ops/sec |
Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.
Benchmark Definition
The provided JSON represents the benchmark definition, which includes:
Script Preparation Code
: This code is executed before running the test cases. In this case, it defines two variables: a
and b
, both containing string literals.Html Preparation Code
: There's no HTML preparation code specified in this example.Individual Test Cases
There are two test cases:
**: This test case runs a single JavaScript statement that uses the
/character as a regular expression (regex) to search for a pattern in both strings
aand
b. The
console.log()` statements will output whether or not the regex matches.**: This test case also runs two
console.log()statements, but instead of using regex, it uses the
startsWith()method to check if each string starts with
/`.Options Compared
The benchmark is comparing the performance of these two approaches:
"regex"
test case)"noregex"
test case)Pros and Cons of Each Approach:
Regex (":regex")
Pros:
Cons:
Non-Regex ("noregex"
)
Pros:
Cons:
Library: startsWith()
In the "noregex"
test case, the startsWith()
method is used. This is a built-in JavaScript method that checks if a string starts with a specified value. It's a simple and efficient way to perform this type of comparison.
Special JS Feature/ Syntax: None
There are no special JavaScript features or syntaxes being tested in this benchmark. Both test cases use standard JavaScript methods and operators.
Other Alternatives
If you're looking for alternative approaches to string matching, consider the following:
lodash.string
RegExp
(though still slower than non-regex approaches)Keep in mind that the choice of approach depends on your specific use case and performance requirements.
I hope this explanation helps you understand what's being tested in this MeasureThat.net benchmark!