Benchmark: if vs noop - MeasureThat.net

Script Preparation code:

var undef = undefined;
var noop = function noop(){};
var noopArrow = () => {};

Tests:

if
if (undef) { undef(); }
noop
noop();
noop arrow
noopArrow();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if
noop
noop arrow

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Linux

View result in a separate tab

Test name	Executions per second
if	799914048.0 Ops/sec
noop	744041280.0 Ops/sec
noop arrow	632146688.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial for optimizing and improving the efficiency of code. Let's break down the provided benchmark JSON and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**

The benchmark definition provides three options:

1. `if (undef) { undef(); }`: This option tests the execution time of an `if` statement with a condition that always evaluates to `true`. The presence or absence of the `undef` variable doesn't affect the outcome, making it a simple and controlled test.
2. `noop()`: No operation is performed in this case, as the function does nothing. This test measures the overhead of calling an empty function.
3. `noopArrow()`: Similar to `noop()`, but using an arrow function syntax (`() => {}`). Arrow functions are a concise way to define small functions.

**Pros and Cons**

1. **`if (undef) { undef(); }`**:
	* Pros: Simple, controlled test that isolates the effect of branching.
	* Cons: May not accurately represent real-world scenarios where branching is more complex.
2. **`noop()`**:
	* Pros: Measures function call overhead, useful for optimizing function calls.
	* Cons: Doesn't account for any potential benefits of calling an empty function (e.g., avoiding stack size issues).
3. **`noopArrow()`**:
	* Pros: Similar to `noop()`, but with the added benefit of being more concise and readable.
	* Cons: May not be supported in older browsers or environments.

**Library: Underscore.js**

In the provided benchmark, a library called Underscore.js is used. Specifically, the `_.isUndefined` function is utilized to set the value of `undef`. The purpose of this function is to check if a value is undefined, which helps ensure that the `if` statement condition always evaluates to `true`.

**Special JS Feature: Arrow Functions**

The use of arrow functions (`() => {}`) in `noopArrow()` and some modern JavaScript code provides a concise way to define small, one-time-use functions. This feature was introduced in ECMAScript 2015 (ES6) and has since become widely adopted.

In the context of this benchmark, using an arrow function for `noop` is equivalent to using a regular function expression (`var noop = function() {}`). The main difference is that arrow functions are more concise and don't require the use of `this` or `arguments` binding.

**Other Alternatives**

Some alternative approaches to measuring JavaScript performance include:

1. **Benchmarks with complex scenarios**: Instead of using simple conditions, benchmarks can simulate real-world scenarios with multiple variables, loops, and conditional statements.
2. **Multi-threaded or parallel processing**: Measures the performance of concurrent execution by running multiple threads or processes simultaneously.
3. **WebAssembly (WASM) benchmarks**: Optimizes JavaScript code for WebAssembly compilation, allowing for faster execution on a wider range of platforms.

In conclusion, this benchmark provides valuable insights into the performance implications of using `if` statements with undefined conditions, no-op functions, and arrow function syntax in modern JavaScript. By understanding these factors, developers can optimize their code for better performance and efficiency.

Related benchmarks:

if vs noop (version: 0)

Comparing performance of: if vs noop vs noop arrow

Created: 9 years ago by: Guest

Jump to the latest result

if

noop

noop arrow

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):