Benchmark: every vs for 2 - MeasureThat.net

Script Preparation code:

var k = 'y';
var a = 'a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,r,q,s,t,u,v,w,x,y,z'.split(',');

Tests:

for
(function(){ for (let i = 0, l = a.length; i < l; ++i) { if (a[i] === k) return false; } return true })()
every
(function(){ return a.every(key => { return key !== k; }) })()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
every

Fastest: N/A

Slowest: N/A

Latest 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 on MeasureThat.net.

**Benchmark Definition and Options**

The provided benchmark definition is comparing two different approaches for iterating over an array: `for` loop and `every()` method.

* **For Loop**: The `for` loop iterates over the array using a traditional incrementing index (`i`) and checks each element against the constant value `k`.
* **Every() Method**: The `every()` method takes a callback function as an argument, which is applied to each element in the array. If any element passes the test (in this case, not being equal to `k`), the method returns `false`. If all elements pass the test, it returns `true`.

**Pros and Cons**

* **For Loop**:
	+ Pros: Simple, straightforward, and widely supported.
	+ Cons: Can be slower due to the need for explicit index management.
* **Every() Method**:
	+ Pros: Concise, expressive, and often faster due to its optimized internal implementation.
	+ Cons: May have higher overhead due to function invocation and potential callback complexity.

**Library**

The `every()` method uses the Array.prototype.every() method, which is a built-in JavaScript method that applies the provided callback function to each element in the array. This method is implemented in C++ by the V8 engine (used by Chrome) and is optimized for performance.

**Special JS Feature/Syntax**

None mentioned in this specific benchmark definition.

**Benchmark Preparation Code**

The script preparation code includes:

* A constant string `k` containing a single character.
* An array `a` with multiple elements, separated by commas. The array is split into individual elements using the `split()` method.

**Other Alternatives**

For similar use cases, consider these alternatives:

1. **Array.prototype.forEach()**: While not as concise as `every()`, `forEach()` can be useful for iterating over arrays and executing side effects.
2. **while` Loop**: A traditional while loop can also be used to iterate over an array, but it may require more explicit index management.

In conclusion, the benchmark on MeasureThat.net is designed to compare two approaches for iterating over arrays: `for` loops and the `every()` method. The results will help users understand which approach performs better in different scenarios.

Related benchmarks:

every vs for 2 (version: 0)

Comparing performance of: for vs every

Created: 7 years ago by: Guest

Jump to the latest result

for

every

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):