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splice vs filter array
(version: 0)
Comparing performance of:
slice vs filter
Created:
3 years ago
by:
Registered User
Go to the latest result
Script Preparation code:
var test=Array.from({length: 100},()=>Math.random())
Tests:
slice
test.splice(50,1)
filter
test.filter((e,i)=>i!=50)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
filter
Fastest:
N/A
Slowest:
N/A
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/109.0.0.0 Safari/537.36
Browser/OS:
Chrome 109 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=581926" width="100%" height="500px"></iframe>
slice
19.7M/s
filter
1.1M/s
View exact numbers
Test name
Executions per second
✓
slice
19,663,742 Ops/sec
filter
1,094,392 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the provided benchmark definition and test cases. **What is tested:** The benchmark tests the performance difference between two JavaScript methods for removing elements from an array: `splice` and `filter`. The arrays are generated using `Array.from()` and filled with random numbers, ensuring that the results are not influenced by specific values or patterns. **Options compared:** Two options are compared: 1. **`splice(50, 1)`**: This method removes the element at index 50 from the array. 2. **`filter((e, i) => i != 50)`**: This method creates a new array containing only the elements that do not match the condition `i != 50`, effectively removing the element at index 50. **Pros and cons of each approach:** 1. **`splice`**: * Pros: Efficient in terms of memory usage, as it modifies the original array. * Cons: Modifies the original array, which might be undesirable for certain use cases (e.g., when preserving the original array's state). 2. **`filter`**: * Pros: Preserves the original array, making it suitable for scenarios where the original data needs to remain intact. * Cons: Creates a new array, potentially leading to increased memory usage. **Library and purpose:** In this benchmark, `Array.from()` is used to generate an array of random numbers. This library is a modern JavaScript method that creates a new array populated with elements from an iterable (in this case, a function). **Special JS feature or syntax:** The `filter` method uses the arrow function syntax (`(e, i) => i != 50`). Arrow functions are a concise way to define small, single-expression functions in JavaScript. They were introduced in ECMAScript 2015 and have since become a popular choice for simple function definitions. **Other alternatives:** If you're looking for alternative approaches to remove elements from an array: * **`map()`**: While not suitable for removing elements, `map()` can be used with the `every()` method to filter out unwanted values. * **`reduce()`**: This method can also be used to filter elements, but it's typically more complex and less efficient than `filter`. * **`forEach()`**: Not recommended for large datasets or performance-critical scenarios, as it's generally slower and less memory-efficient than `filter`. For removing elements from an array specifically: * **`splice()`**: As mentioned earlier, this method is efficient in terms of memory usage but modifies the original array. * **`slice()`**: Similar to `splice()`, but creates a shallow copy of the array slice. * **`Array.prototype.remove()`**: A modern alternative to `splice()`, which creates a new array with the removed element. In summary, the benchmark compares the performance of two methods for removing elements from an array: `splice` and `filter`. The choice between these approaches depends on your specific use case requirements, such as preserving the original array's state or minimizing memory usage.
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