Benchmark: every vs ES6 for-of

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>

Script Preparation code:

var users = [
  { 'user': 'barney', 'age': 6 },
  { 'user': 'fred',   'age': 40 },
  { 'user': 'ed',   'age': 50 }
];

for(let i = 0; i < 2000; i++) {
  var newUser = { 'name': 'user_' + i, 'age': Math.floor(Math.random() * i) };
  users.push(newUser);
}

function lodashEvery(arr, limit) {
  return _.every(arr, (user) => user.age > limit)
}

function every(arr, limit) {
  for (const ar of arr) {
    if(ar.age > limit) {
      return true
    }
    return false
   }
}

Tests:

_.every
const everyCase1 = lodashEvery(users, 10)
ES6 for of
const everyCase2 = every(users, 10)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.every
ES6 for of

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.every	46190032.0 Ops/sec
ES6 for of	135671360.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition**

The benchmark is designed to compare the performance of two approaches: Lodash's `every` function and the built-in `for...of` loop in JavaScript (ES6).

**Options Compared**

Two options are compared:

1. **Lodash's `every` function**: This function takes an array and a predicate function as arguments. It returns `true` if all elements in the array pass the predicate test, and `false` otherwise.
2. **Built-in `for...of` loop (ES6)**: This is a more traditional way of iterating over arrays in JavaScript. It uses a for-of loop to iterate over each element in the array, checking the condition inside the loop.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Lodash's `every` function**:
	+ Pros: concise, easy to read, and well-documented.
	+ Cons: external dependency (Lodash), might be slower due to the overhead of the library.
* **Built-in `for...of` loop**:
	+ Pros: no external dependencies, simple and straightforward implementation.
	+ Cons: more verbose, requires manual iteration over the array.

**Library Used**

The benchmark uses Lodash, a popular JavaScript utility library that provides a wide range of functions for tasks such as data manipulation, string manipulation, and functional programming. In this case, the `every` function is used to test the performance of the approach.

**Special JS Feature or Syntax**

There isn't any special JS feature or syntax being tested here. The benchmark only focuses on comparing the performance of two different approaches for iterating over an array.

**Other Considerations**

When choosing between these two approaches, consider the trade-offs:

* **Readability**: Lodash's `every` function is more concise and easier to read, while the built-in `for...of` loop is more verbose.
* **Performance**: The benchmark results show that Lodash's `every` function might be slower than the built-in `for...of` loop due to the overhead of the library. However, this difference might not be significant in most cases.
* **External Dependencies**: Using an external library like Lodash can add complexity and dependencies to your codebase.

**Alternatives**

If you don't want to use an external library like Lodash, you could consider using other libraries or built-in functions that provide similar functionality. Some alternatives include:

* **Array.prototype.every()**: This is a built-in function in modern JavaScript versions (ECMAScript 2019+). It's equivalent to Lodash's `every` function but doesn't require an external library.
* **Other functional programming libraries**: There are other libraries, such as Ramda or Purescript, that provide similar functionality to Lodash.

Related benchmarks:

every vs ES6 for-of (version: 0)

Comparing performance of: _.every vs ES6 for of

Created: 3 years ago by: Guest

Jump to the latest result

_.every

ES6 for of

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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