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Slice vs Map (2222211111)
(version: 0)
Comparing performance of:
slice vs map
Created:
5 years ago
by:
Registered User
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Tests:
slice
var item = 10; var index = 50; var array = Array.from({length: 100}); var array2 = [...array.slice(0, index), item, ...array.slice(index + 1)];
map
var item = 10; var index = 50; var array = Array.from({length: 100}).map((val, i) => i === index ? item : val);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
map
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
22 days ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/147.0.0.0
Browser/OS:
Chrome 147 on Windows
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<iframe src="https://measurethat.net/Embed?id=627874" width="100%" height="500px"></iframe>
Test name
Executions per second
slice
134014.6 Ops/sec
map
131316.8 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided benchmark. **Overview** The benchmark is comparing two approaches to create an array by concatenating and slicing another array: 1. Using `Array.prototype.slice()` method with `array.slice(0, index), item, ...array.slice(index + 1)` 2. Using `Array.prototype.map()` function with a callback function that returns either the original value or a custom value (`item`) at the specified index. **Options compared** The benchmark is comparing two options: 1. **Slice method**: This approach uses the `slice()` method to create new arrays, which can be slower than other methods because it creates new objects. 2. **Map function**: This approach uses the `map()` function with a callback function that returns either the original value or a custom value (`item`) at the specified index. **Pros and Cons** * **Slice method**: + Pros: Simple and easy to read, can be efficient if used correctly (avoiding unnecessary object creation). + Cons: Can be slower than other methods due to object creation. * **Map function**: + Pros: Can be more concise and expressive, can avoid unnecessary object creation. + Cons: May require additional library dependencies (e.g., for browser compatibility) or can be slower due to function call overhead. **Library usage** There is no explicit library mentioned in the benchmark definition. However, it's worth noting that `Array.prototype.slice()` and `Array.prototype.map()` are built-in methods on arrays in JavaScript. **Special JS feature/syntax** There are no special JavaScript features or syntax used in this benchmark. It only uses standard ECMAScript syntax for array manipulation. **Other alternatives** If you're looking for alternative approaches, consider the following: 1. **Using `Array.prototype.forEach()`**: This method can be more concise and expressive than `map()`, but it doesn't return an array. 2. **Using `Array.prototype.reduce()`**: This method can be used to create a new array by accumulating elements from an existing array, but it's not directly applicable here. 3. **Using a custom loop**: You could write a simple loop to concatenate and slice the arrays, but this approach would likely be slower than the built-in methods. In general, when working with arrays in JavaScript, `map()` is often a good choice for transformations, while `slice()` can be used for more complex array manipulations.
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