"Hello this is a test, would you look at that".startsWith("bonjour")
"Hello this is a test, would you look at that".includes("bonjour")
/^bonjour/.test("Hello this is a test, would you look at that")
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
"Hello this is a test, would you look at that".startsWith("bonjour") | |
"Hello this is a test, would you look at that".includes("bonjour") | |
/^bonjour/.test("Hello this is a test, would you look at that") |
Test name | Executions per second |
---|---|
"Hello this is a test, would you look at that".startsWith("bonjour") | 79062032.0 Ops/sec |
"Hello this is a test, would you look at that".includes("bonjour") | 33572068.0 Ops/sec |
/^bonjour/.test("Hello this is a test, would you look at that") | 516786816.0 Ops/sec |
Let's break down the provided benchmark definition and test cases.
Benchmark Definition JSON: The provided JSON represents a JavaScript microbenchmarking framework called MeasureThat.net. It defines three test cases:
startsWith
methodincludes
method/regex
) matchingEach test case has a unique description, script preparation code, and HTML preparation code.
Individual Test Cases: The benchmark consists of three individual test cases:
"Hello this is a test, would you look at that".startsWith("bonjour")
startsWith
method to check if the string "Hello this is a test, would you look at that" starts with the substring "bonjour"."Hello this is a test, would you look at that".includes("bonjour")
includes
method to check if the string "Hello this is a test, would you look at that" contains the substring "bonjour"./^bonjour/.test("Hello this is a test, would you look at that")
/^bonjour/
) to match the string "Hello this is a test, would you look at that" against the pattern "bonjour".Comparison of Options:
startsWith
vs includes
: These two methods differ in their behavior when searching for substrings.
startsWith
: This method returns true if the string starts with the specified substring. It is more efficient than includes
because it only needs to check a fixed-length prefix.Pros of startsWith
:
Cons of startsWith
:
includes
In contrast, includes
checks for any occurrence of the substring within the entire string, including after the initial index. This can lead to slower execution times due to increased computational overhead.
/regex
: Regular expressions provide a flexible and powerful way to match patterns in strings. However, they come with a performance cost due to the additional complexity of parsing and executing the regular expression.
Pros of regular expressions:
Cons of regular expressions:
startsWith
or includes
Library Used:
The provided benchmark definitions use built-in JavaScript methods (startsWith
, includes
) and a regular expression library ( /regex
is not specific to any library but rather a standard syntax in JavaScript).
Other Considerations:
Alternatives: If you were to recreate this benchmark using alternative methods or tools, some options might include:
re
module), you can use pre-built regular expression libraries with optimized implementations.Keep in mind that this is a high-level overview of the options and considerations involved in creating and optimizing microbenchmarks like the one provided by MeasureThat.net.