Benchmark: for vs foreach vs some vs every vs for..of vs map with mutation fixing bug with every

Script Preparation code:

var array = new Array(100);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i] = array[i] * 2; }
foreach
array.forEach(function(i) { array[i] = array[i] * 2; });
some
array.some(function(i) { array[i] = array[i] * 2; });
every
array.every(function(i) { array[i] = array[i] * 2; return true });
for..of
for (var i of array) { array[i] = array[i] * 2; }
map
array.map(a => a * 2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
every
for..of
map

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The benchmark is designed to compare the performance of different loop constructs in JavaScript: `for`, `foreach`, `some`, `every`, and `for..of`. The goal is to measure which construct provides the best performance.

**Options Compared**

Here's a breakdown of each option:

1. **`for`**: A traditional, iterative loop that increments an index variable (`i`) until it reaches the end of the array.
2. **`foreach`**: A loop that iterates over an array using an iterator (in this case, the `Array.prototype.forEach()` method).
3. **`some`**: A loop that returns true as soon as a condition is met, and continues iterating if not. This is used to check if any element in the array meets a certain condition.
4. **`every`**: Similar to `some`, but returns true only if all elements meet a certain condition.
5. **`for..of`**: A newer loop construct that allows for more concise code and automatic index tracking.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **`for`**:
	* Pros: Simple, easy to understand, and works well with arrays.
	* Cons: Can be verbose, especially when dealing with large arrays or complex conditions.
2. **`foreach`**:
	* Pros: Concise and readable code, automatic iteration over the array.
	* Cons: May not be as efficient as other methods due to the overhead of `forEach()`.
3. **`some`** and **`every`**:
	* Pros: Can be more efficient than `for` or `foreach`, especially for large arrays or complex conditions.
	* Cons: Require careful consideration of edge cases, as they return early if a condition is met.
4. **`for..of`**:
	* Pros: More concise and readable code, automatic index tracking, and better support for iterable objects.
	* Cons: May not be supported in older browsers or environments.

**Library Usage**

None of the benchmarks use external libraries.

**Special JS Features or Syntax**

The `every` method uses a special syntax to return early if a condition is met (`return true`). This feature allows for concise and efficient code, but can also lead to unexpected behavior if not used carefully.

**Other Considerations**

When writing loops in JavaScript, consider the following:

* Use arrays instead of objects or other data structures when possible.
* Avoid unnecessary computations or memory allocations.
* Use caching or memoization techniques to reduce computation overhead.
* Optimize loop performance by reducing iteration counts or using optimized algorithms.

**Alternatives**

If you're looking for alternative benchmarking tools, consider the following:

* Google's Benchmark
* Mozilla's WebAssembly Benchmarks
* Node.js Performance Testers (e.g., `perf-test`)
* Jasmine or Mocha for unit testing and benchmarking

These tools provide more comprehensive benchmarking capabilities, but may require more setup and configuration.

Related benchmarks:

for vs foreach vs some vs every vs for..of vs map with mutation fixing bug with every (version: 0)

Compare loop performance

Comparing performance of: for vs foreach vs some vs every vs for..of vs map

Created: 3 years ago by: Guest

Jump to the latest result

for

foreach

some

every

for..of

map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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