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New Array - Array.prototype.slice vs spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
2 years ago
by:
Guest
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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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Test case name
Result
Array.prototype.slice
spread operator
Fastest:
N/A
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N/A
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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. **Benchmark Overview** The benchmark compares two approaches to create a new array from an existing one: 1. **Array.prototype.slice()**: A traditional method that creates a shallow copy of a portion of an array, starting at the index specified. 2. **Spread Operator (`...`)**: A new ES6 feature that allows creating a new array by spreading an existing array's elements. **Options Compared** The benchmark compares these two approaches: * `Array.prototype.slice()`: This method creates a shallow copy of a portion of an array. * Spread Operator (`...`): This method creates a new array by spreading the elements of an existing array. **Pros and Cons** **Array.prototype.slice():** Pros: * Widely supported in older browsers (not all modern browsers support `...`) * Can be more efficient for small arrays, since it only copies the necessary elements. * Familiar interface for many developers. Cons: * Creates a shallow copy, which may not be suitable for complex data structures (it only copies references to objects). * Can be slower than the spread operator for large arrays. **Spread Operator (`...`):** Pros: * Creates a deep copy of an array, ensuring that all nested objects are properly copied. * Often faster and more efficient than `slice()` for large arrays. * Easy to use and understand. Cons: * Not as widely supported in older browsers (only introduced in ES6). * May not be suitable for very small arrays, since it creates a new array with unnecessary elements. **Other Considerations** The benchmark does not account for other factors that might affect performance, such as: * The size of the input array * The specific use case or application domain * Potential optimizations available in JavaScript engines If you're interested in exploring alternative approaches, consider: * Using `Array.from()` instead of spread operator (similar to `slice()`, but with a more explicit interface). * Using `Array.prototype.concat()` or other methods for creating arrays. * Investigating browser-specific features or workarounds. **Library and Special JS Features** In this benchmark, the only library used is `...` (the spread operator), which is a native JavaScript feature introduced in ES6. There are no external libraries required. The benchmark does not use any special JS features beyond what's covered by the provided options.
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