var string = "Hello world!";
var regex = /Hello/i;
regex.test(string);
string.toLowerCase().includes("Hello".toLowerCase());
string.match("Hello");
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
RegEx.test | |
String.includes | |
String.match |
Test name | Executions per second |
---|---|
RegEx.test | 46558752.0 Ops/sec |
String.includes | 157806928.0 Ops/sec |
String.match | 6383480.5 Ops/sec |
The benchmark defined in the provided JSON tests the performance of three different approaches to check for the presence of a substring in a string in JavaScript, specifically in a case-insensitive manner. Below are the details of the options compared and their respective pros and cons.
RegEx.test
regex.test(string);
String.includes
string.toLowerCase().includes("Hello".toLowerCase());
String.match
string.match("Hello");
includes
, particularly for a simple substring check.The benchmark results indicate that the String.includes
method performed the best, with an execution rate of 157,806,928 operations per second. This is likely due to its direct approach for substring searching without the overhead of regex compilation or complex parsing.
The RegEx.test
method came in second with 46,558,752 executions per second. While it has the disadvantage of regex overhead, it still presents utility for situations requiring more complex string matching.
The String.match
method was significantly slower at 6,383,480 executions per second. This approach, while capable of returning detailed match information, appears to be less efficient for purely checking substring presence—especially since, in this case, regular expressions were not leveraged.
Use Case: The choice between these methods ultimately depends on the specific needs of the application. If only simple presence checks are required, String.includes
is often the most appropriate choice. If complex pattern matching is necessary, RegEx.test
may be the better option, despite the potential performance cost.
Readability and Maintainability: Developers should also consider maintainability. The readability of String.includes
makes it an attractive option when working with other developers who may not be familiar with regex.
Alternatives: In addition to the methods tested, alternatives like string comparison (string.indexOf('Hello') !== -1
) can also be used for substring presence checks. Similarly, more modern JavaScript frameworks can offer utilities or libraries for string manipulation and searching that may include optimizations beyond native implementations.
By weighing these considerations and understanding the context of each method, developers can choose the most appropriate option based on their performance requirements and use cases.