Benchmark: Testing loops and finds

Script Preparation code:

window.arr = new Array(100000).fill().map((x, i) => Math.random()*100000);
window.target = arr[50000];

Tests:

for loop
for(i=0; i<window.arr.length; i++){ var value = arr[i]; if (value === window.target) { val = value; break; } }for(i=0; i<window.arr.length; i++){ var value = arr[i]; if (value === window.target) { val = value; break; } }for(i=0; i<window.arr.length; i++){ var value = arr[i]; if (value === window.target) { val = value; break; } }
for of
let val; for (var value of window.arr) { if (value === window.target) { val = value; break; } }
array find
let val = window.arr.find(val => val === window.target);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
for of
array find

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The provided benchmark tests three different approaches to find an element in an array:

1. **For loop**: Uses a traditional `for` loop to iterate through the array.
2. **For of**: Utilizes the `for...of` loop syntax to iterate through the array.
3. **Array find**: Leverages the `find()` method to search for the target value.

**Script Preparation Code**

The script preparation code sets up an array `arr` with 100,000 elements, each filled with a random number between 0 and 100,000. It also defines a `target` variable as the middle element of the array (`arr[50000]`).

**Test Cases**

There are three test cases:

1. **For loop**: The benchmark executes a traditional `for` loop twice to find the target value.
2. **For of**: The benchmark uses the `for...of` loop syntax to iterate through the array and find the target value.
3. **Array find**: The benchmark uses the `find()` method to search for the target value in the array.

**Comparison**

The test cases are compared based on their execution speed, measured in executions per second (`ExecutionsPerSecond`). The browser, device platform, operating system, and raw UA string (User Agent) are also reported.

**Pros and Cons of Each Approach**

1. **For loop**: Traditional `for` loops can be more predictable and easier to optimize for performance, but they can also lead to slower execution times due to the overhead of incrementing the index variable.
2. **For of**: The `for...of` loop syntax is a modern and concise way to iterate through arrays, but it may not provide direct access to the index variable, which can make optimization more challenging. However, `for...of` loops are generally faster than traditional `for` loops due to better compiler optimizations.
3. **Array find**: The `find()` method is a convenient and efficient way to search for an element in an array, but it may incur additional overhead due to the creation of an intermediate iterator object.

**Library Usage**

None of the test cases use any external libraries beyond the built-in JavaScript features.

**Special JS Features or Syntax**

The benchmark uses the following modern JavaScript feature:

* `for...of` loop syntax (introduced in ECMAScript 2015)
* `find()` method (introduced in ECMAScript 2015)

**Other Alternatives**

Some alternative approaches to find an element in an array include:

* Using a linear search algorithm, which involves checking each element individually.
* Utilizing a binary search algorithm, which takes advantage of the array's sorted nature to reduce the number of comparisons required.

However, these alternatives are typically less efficient than the `find()` method and may not provide better performance for large arrays.

Related benchmarks:

Testing loops and finds (version: 0)

Comparing performance of: for loop vs for of vs array find

Created: 3 years ago by: Guest

Jump to the latest result

for loop

for of

array find

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):