function getRandomInt(max) {
return Math.floor(Math.random() * Math.floor(max));
}
var arr = [];
for (i = 0; i < 1000; i++) {
arr.push("PROPERTY_" + getRandomInt(10000));
arr.push("RUS_" + getRandomInt(10000));
}
var success = 0;
for(const value of arr) {
if(/^PROPERTY_/.test(value)) success++;
}
for(const value of arr) {
if(value.substring(0, 9) === "PROPERTY_") success++;
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
RegExp | |
substring |
Test name | Executions per second |
---|---|
RegExp | 2928.7 Ops/sec |
substring | 4927.6 Ops/sec |
Let's break down the provided benchmark and its options.
Benchmark Overview
The benchmark compares two approaches to test strings for a specific property: using RegExp
or substring
.
Options Compared
There are two test cases:
/^PROPERTY_/
) to check if the string starts with "PROPERTY_".substring
method to extract the first 9 characters of the string and checks if it matches "PROPERTY_".Pros and Cons
RegExp
Pros:
Cons:
substring
Pros:
Cons:
Other Considerations
substring
might be a better choice. However, for more complex pattern matching or advanced operations, RegExp
is usually the better option.Library Usage
Neither of the approaches uses any external libraries. They are built-in JavaScript methods and functions that can be used directly in most JavaScript applications.
Special JS Features/Syntax
The benchmark does not use any special JavaScript features or syntax beyond what's standard for modern JavaScript. However, if you're interested in exploring more advanced options, some popular alternatives to RegExp
include:
String.prototype.match()
: This method returns an array of matches if the string passes a pattern test, allowing for more flexibility than RegExp
.String.prototype.indexOf()
: This method returns the index of the first occurrence of a specified value, which can be used in combination with other methods to achieve similar results to RegExp
.Other Alternatives
For comparing different JavaScript implementations or optimizing specific parts of your codebase, you might want to explore: