"-5".includes("-")
"-5" < 0
"-5".indexOf("-") > -1
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Includes | |
Lt | |
Index of |
Test name | Executions per second |
---|---|
Includes | 37866924.0 Ops/sec |
Lt | 25740606.0 Ops/sec |
Index of | 43423712.0 Ops/sec |
Let's break down the provided benchmark information and explain what's being tested.
Benchmark Definition
The benchmark definition is a JSON object that contains three properties:
Name
: The name of the benchmark, which is "Is negative fork".Description
: An empty string, indicating that there's no description for this benchmark.Script Preparation Code
and Html Preparation Code
: Both are null, meaning that no code needs to be prepared or executed before running the benchmark.Individual Test Cases
The benchmark consists of three test cases, each represented by an object in the following format:
Benchmark Definition
: A string representing a JavaScript expression. This is where the actual benchmarking happens.Test Name
: A descriptive name for each test case, such as "Includes", "Lt", and "Index of".Let's analyze each test case:
: The benchmark definition
""-5".includes("-")"tests whether the string "-5" includes the character "-" using the
includes()` method.: The benchmark definition
""-5" < 0"tests whether the value of the expression
""-5""` is less than 0. This test case uses a numerical comparison, which might be evaluated differently by various JavaScript engines or browsers.: The benchmark definition
""-5".indexOf("-") > -1"` tests whether the index of the character "-" in the string "-5" is greater than -1.Options Compared
The three test cases compare different aspects of JavaScript:
includes()
: Tests the behavior of the includes()
method, which returns a boolean value indicating whether a specified value exists within a string.<
): Tests how JavaScript evaluates numerical expressions, including integer overflow or underflow scenarios.indexOf()
) : Tests the behavior of the indexOf()
method, which returns the index of the first occurrence of a specified character in a string.Pros and Cons
Here's a brief analysis of each test case:
includes()
: This test is useful for understanding how JavaScript handles string matching, including edge cases like empty strings or null values.<
): This test highlights potential issues with integer overflow or underflow in JavaScript engines.indexOf()
: This test evaluates how JavaScript handles string indexing, which can impact performance and security in certain scenarios.Other Considerations
When running benchmarks, it's essential to consider factors such as:
Alternatives
If you're interested in running similar benchmarks, consider exploring other options:
Keep in mind that MeasureThat.net provides a unique value proposition by offering a simple, web-based platform for creating and running JavaScript microbenchmarks.