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window.regex = new RegExp("^test");
window.match = 'test';
var data = window.data = [];
const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000;
function getRandomInt(max) {
return Math.floor(Math.random() * max);
}
function makeRandomString(len) {
var text = "";
for( var i=0; i < len; i++ ) {
text += possible.charAt(getRandomInt(possible.length));
}
return text;
}
while (data.length < TOTAL_STRINGS) {
data.push(makeRandomString(getRandomInt(20)));
}
var x = 0;
var TOTAL_STRINGS = window.TOTAL_STRINGS;
var data = window.data;
var regex = window.regex;
while (x < TOTAL_STRINGS) {
const str = data[x];
regex.test(str);
x += 1;
}
var x = 0;
var TOTAL_STRINGS = window.TOTAL_STRINGS;
var data = window.data;
var match = window.match;
while (x < TOTAL_STRINGS) {
const str = data[x];
str.startsWith(match);
x += 1;
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Regex | |
.indexOf |
Test name | Executions per second |
---|---|
Regex | 381.6 Ops/sec |
.indexOf | 496.4 Ops/sec |
I'll provide an explanation of the provided JSON, benchmark options, and considerations.
Benchmark Definition JSON
The benchmark.json
file defines two test cases:
Regex
: Tests the performance of using a regular expression (regex
) to check if a string (str
) matches a pattern..indexOf
, .startsWith
, and .substr
: Tests the performance of using the .indexOf
, .startsWith
, and .substr
methods, respectively, on strings.Options Compared
The benchmark compares the performance of:
regex
): Using a regular expression to search for a pattern in a string..indexOf
: Using the .indexOf
method to find the index of a substring within another string..startsWith
: Using the .startsWith
method to check if a string starts with another string..substr
: Using the .substr
method to extract a subset of characters from a string.Pros and Cons
regex
):.indexOf
, .startsWith
, and .substr
:Library Used
None explicitly mentioned, but it's likely that the RegExp
constructor is being used to create a regular expression object.
Special JS Feature or Syntax
No special JavaScript features or syntax are explicitly mentioned in this benchmark.
Other Considerations
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
) to simulate real-world string data.while
loop to iterate over the generated strings, ensuring that each string is processed multiple times.Alternative Benchmarks
Other benchmarks could be used to compare these options:
.includes
: Using the .includes
method instead of .indexOf
.match()
method instead of regular expressions.includes()
method on arrays instead of strings.These alternatives would provide additional insights into the performance characteristics of each option in different contexts.