Benchmark: for vs every - MeasureThat.net

Script Preparation code:

var array = new Array(100);

Tests:

for
function asd(arg) { return arg === 50; } function dsa() { for (var i = 0; i < array.length; i++) { if (asd(i)) { return; } } } dsa()
every
function asd(arg) { return arg === 50; } function dsa() { return array.every((item, index) => asd(index)); } dsa()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
every

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation.

**Benchmark Purpose**

The benchmark measures the performance difference between two approaches: `for` loop and `every()` method in JavaScript. The purpose is to compare the execution speed of these two loops when iterating over an array of 100 elements.

**Options Compared**

Two options are compared:

1. **For Loop**: A traditional `for` loop that iterates over the array using a manual index variable.
2. **Every() Method**: An array method that returns `true` if all elements in the array pass the test implemented by the provided function.

**Pros and Cons of Each Approach**

*   **For Loop:**
    *   Pros:
        *   More control over loop iterations (e.g., breaking out early)
        *   May be more efficient for small arrays or specific use cases
    *   Cons:
        *   Requires manual index management, which can lead to errors
        *   Less concise and readable than other approaches
*   **Every() Method:**
    *   Pros:
        *   More concise and readable than traditional `for` loops
        *   Eliminates the need for manual index management
    *   Cons:
        *   May be less efficient due to additional overhead from function calls

**Library/Function**

The `every()` method is a built-in JavaScript array method. It takes two arguments: a function and an array. The function is called on each element in the array, and if it returns `true` for all elements, the `every()` method returns `true`. If at least one element returns `false`, the method returns `false`.

**Special JS Feature/Syntax**

The benchmark utilizes JavaScript's iterator protocol and the ability to use arrow functions with `every()`. The `every()` method is a part of the ECMAScript 2015 (ES6) standard, which introduces several new features and improvements.

**Alternatives**

Other alternatives for iterating over arrays in JavaScript include:

*   **forEach() Method**: Similar to `every()`, but returns no value when all elements pass the test.
*   **map(), filter(), reduce() Methods**: These methods operate on arrays differently, such as mapping each element to a new value or filtering out elements that don't meet a condition.

Keep in mind that these alternatives may not be directly comparable to `for` loops and `every()` method in terms of performance or use cases.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
for	283350.1 Ops/sec
every	3843365.5 Ops/sec

Related benchmarks:

for vs every (version: 0)

Compare loop performance

Comparing performance of: for vs every

Created: one year ago by: Guest

Jump to the latest result

for

every

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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