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Array.prototype.slice vs Array.from()
(version: 0)
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
4 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].slice();
spread operator
var params = [ "hello", true, 7 ] var other = Array.from(params);
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Suite status:
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Test case name
Result
Array.prototype.slice
spread operator
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested, compared, and some considerations for each approach. **Benchmark Definition** The benchmark is defined as `Array.prototype.slice vs Array.from()`, which means it's comparing the performance of two methods: `slice()` on the `Array` prototype and `Array.from()` with a spread operator (`...`) to create an array. **Options Compared** Two options are being compared: 1. **Array.prototype.slice**: This method creates a shallow copy of a portion of an array, starting from a specified index (inclusive) up to but not including the end index. 2. **Array.from() with spread operator**: This method creates a new array by copying elements from an iterable or an array. **Pros and Cons** **Array.prototype.slice**: Pros: * Well-established and widely supported * Can be used with arrays of any type, not just primitive values Cons: * Creates a new array object, which can lead to increased memory usage * May perform poorly if the original array is very large or has many elements * Can be slower than other approaches for small arrays **Array.from() with spread operator**: Pros: * More concise and expressive than `slice()` * Can be faster than `slice()` for large arrays, since it avoids creating a new array object * Can handle arrays of any type, not just primitive values Cons: * May perform poorly if the iterable being spread is very large or complex * Requires JavaScript 2015 (ES6) support for spread operator syntax **Other Considerations** The benchmark also mentions two individual test cases with different scripts: 1. `var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].slice();` - This script creates an array `params` and then uses `slice()` on a smaller array `other`. 2. `var params = [ "hello", true, 7 ]\nvar other = Array.from(params);` - This script creates an array `params` and then uses `Array.from()` with spread operator to create another array `other`. **Libraries Used** None of the test cases explicitly use any external libraries. **Special JS Feature or Syntax** The benchmark uses JavaScript 2015 (ES6) syntax for the spread operator (`...`). This feature is not supported in older versions of JavaScript, so it's likely that this benchmark is targeting modern browsers or environments that support ES6.
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