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Array.prototype.slice vs spread operator (updated)
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
3 years ago
by:
Registered User
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
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Suite status:
<idle, ready to run>
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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 benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The benchmark measures the performance difference between using the `Array.prototype.slice()` method and the new ES6 spread operator (`...`) for creating a shallow copy of an array. **Options Compared** Two options are being compared: 1. **`Array.prototype.slice()`**: A traditional method to create a shallow copy of an array, which slices the original array from the specified start index to the end index. 2. **Spread Operator (`...`)**: A new syntax introduced in ES6 to create a new array by spreading the elements of an existing array. **Pros and Cons** * **`Array.prototype.slice()`**: + Pros: Wide browser support, well-established performance. + Cons: Can be slower than the spread operator due to its overhead (e.g., creating a temporary array). * **Spread Operator (`...`)**: + Pros: Faster performance, concise syntax, and better memory usage compared to `slice()`. + Cons: Requires modern JavaScript engines (modern browsers) that support it, may have compatibility issues with older browsers. **Library Used** None. The benchmark only involves built-in JavaScript features. **Special JS Feature/Syntax** The spread operator (`...`) is a new syntax introduced in ES6. It allows creating a new array by spreading the elements of an existing array. **Test Preparation Code and Html Preparation Code** No preparation code or HTML code are provided for this benchmark, which means that the JavaScript arrays being compared will be created using the default behavior (i.e., `var params = [ ...params ]` is equivalent to `var other = Array.prototype.slice(params)`). **Other Alternatives** If you want to test similar benchmarks, you could consider comparing: * Other array creation methods, such as `Array.from()`, `new Array()`, or `Array.isArray()` with the spread operator. * Performance differences between using `slice()` and `map()`. * The impact of array size on performance when creating arrays using various methods. For a more comprehensive understanding of benchmarking JavaScript performance, I recommend exploring other benchmarks and tools, such as: * Benchmark.js * WebPageTest * Google's V8 benchmarking suite Keep in mind that the choice of benchmark and testing methodology depends on your specific use case and requirements.
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