"@MyVariable".startsWith("@")
"@MyVariable".match(/@.*/)
/@*./.test("@MyVariable")
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
startsWith | |
match | |
test |
Test name | Executions per second |
---|---|
startsWith | 2085696256.0 Ops/sec |
match | 38584548.0 Ops/sec |
test | 72152584.0 Ops/sec |
I'll provide an explanation of the benchmark, its options, pros and cons, and other considerations.
Benchmark Overview
The benchmark measures the performance of three different approaches to test if a variable @MyVariable
starts with the string "@"
. The three approaches are:
startsWith
match
/regex/
These tests aim to evaluate the speed of each approach in checking if a string starts with a specific prefix.
Library and Purpose
In this benchmark, the library used is none, but rather JavaScript's built-in functions for regular expressions (regex) and string manipulation.
The purpose of these approaches is to test their performance when checking if a string starts with a certain prefix.
Approach 1: startsWith
startsWith
is a built-in function in JavaScript that checks if a string starts with another string. It returns true
if the first character of the original string matches the first character of the specified string, and false
otherwise.
Pros:
Cons:
Approach 2: match
match
is another built-in function in JavaScript that returns an array containing all matches of the specified regex pattern within the string. In this case, we're using /^@/.test()
to test if the string starts with the prefix "@"
.
Pros:
true
or false
)Cons:
startsWith
due to the regex parsing and evaluationApproach 3: /regex/
This approach uses a regex pattern /@*./
to test if the string starts with the prefix "@"
. The .*
in the regex pattern matches any characters (except newline) zero or more times.
Pros:
Cons:
startsWith
due to the regex parsing and evaluationOther Considerations
In addition to performance, another consideration is memory usage. The match
approach may use more memory since it needs to parse the entire regex pattern.
Alternatives
If you want to test similar benchmarks using alternative approaches, here are some options:
myStartsWith
).includes
, localeCompare
, or indexOf
.Keep in mind that the specific approach and implementation may vary depending on the requirements of your project.
In summary, this benchmark aims to evaluate the performance of three different approaches to test if a variable starts with a certain prefix. The startsWith
function is likely the fastest, followed by the regex-based approaches.