Benchmark: for vs foreach vs some vs every vs for..of vs map 2

Script Preparation code:

var array = new Array(100);

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
every
for..of
map
for 2

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):

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Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The benchmark is designed to compare the performance of different loop constructs in JavaScript: `for`, `foreach`, `some`, `every`, `for..of`, and `map`. The script preparation code initializes an array of length 100, which will be used as input for each test case.

**Loop Constructs Comparison**

Here's a brief explanation of each loop construct:

1. **`for`**: A traditional loop that uses a counter variable (`i`) to iterate over the array indices.
2. **`foreach`**: A loop that iterates over the elements of an array using a callback function. This loop is also known as the "iterator" method.
3. **`some`**: A loop that returns `true` as soon as it finds an element in the array that satisfies the condition (i.e., `array[i]`). If no such element is found, it returns `false`.
4. **`every`**: A loop that returns `true` only if all elements of the array satisfy the condition (i.e., `array[i]`). If at least one element does not satisfy the condition, it returns `false`.
5. **`for..of`**: A newer loop construct introduced in ECMAScript 2015 (ES6). It iterates over the elements of an array using a simple syntax and is optimized for performance.
6. **`map`**: Not strictly a loop construct, but rather a method that creates a new array by transforming each element of the original array using a callback function.

**Pros and Cons**

Here's a brief pros and cons analysis for each loop construct:

1. **`for`**: Pros: simple, well-known, and widely supported. Cons: can be error-prone if not used carefully.
2. **`foreach`**: Pros: concise, readable, and easy to understand. Cons: may lead to slower performance due to the overhead of the iterator object.
3. **`some`** and **`every`**: Pros: concise and expressive. Cons: can be slower than traditional loops due to the additional overhead of the conditional checks.
4. **`for..of`**: Pros: modern, efficient, and optimized for performance. Cons: may require a brief learning curve due to its syntax differences from traditional `for` loops.
5. **`map`**: Pros: concise and expressive, with the added benefit of creating a new array. Cons: can be slower than traditional loops due to the overhead of creating a new array.

**Library Usage**

The test cases use no external libraries besides the built-in JavaScript functions (`array.length`, `forEach`, `some`, `every`, `map`).

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark. The focus is on comparing the performance of different loop constructs.

**Other Alternatives**

If you're interested in exploring more benchmarks, here are some other alternatives:

1. **Bench.js**: A popular benchmarking framework for Node.js and browser-based applications.
2. **BenchmarkJS**: A high-performance benchmarking framework for JavaScript applications.
3. **Microbenchmark**: A lightweight, open-source library for benchmarking small code snippets.

Keep in mind that each of these tools has its own strengths and weaknesses, and the choice of which one to use depends on your specific needs and requirements.

Related benchmarks:

for vs foreach vs some vs every vs for..of vs map 2 (version: 0)

Compare loop performance

Comparing performance of: for vs foreach vs some vs every vs for..of vs map vs for 2

Created: 4 years ago by: Guest

Jump to the latest result

for

foreach

some

every

for..of

map

for 2

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):