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slice method vs spread operator
(version: 0)
Comparing performance of:
slice vs spread
Created:
3 years ago
by:
Guest
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Tests:
slice
const arr = ["foo", "bar", "baz"] const slice = arr.slice()
spread
const arr = ["foo", "bar", "baz"] const spread = [...arr]
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Suite status:
<idle, ready to run>
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Test case name
Result
slice
spread
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark tests the performance of two ways to create a shallow copy of an array in JavaScript: **1. `slice()` Method:** * **Benchmark Definition:** `const arr = ["foo", "bar", "baz"]; const slice = arr.slice();` - This creates a new array by copying elements from the original array (`arr`) using the `slice()` method, which is built into JavaScript arrays. **2. Spread Operator (`...`):** * **Benchmark Definition:** `const arr = ["foo", "bar", "baz"]; const spread = [...arr];` - This creates a new array by using the spread operator (`...`) to expand the elements of the original array (`arr`) into a new array. **Pros and Cons:** * **`slice()`:** - **Pros:** Often considered slightly more performant than the spread operator in some scenarios, particularly for large arrays. - **Cons:** Can be less concise and readable compared to the spread operator. Requires explicit knowledge of the `slice()` method. * **Spread Operator (`...`):** - **Pros:** More concise and expressive syntax. Easier to understand at a glance. Works with various data types beyond just arrays (e.g., objects). - **Cons:** Might have slightly higher overhead compared to `slice()` in certain cases, especially for very large arrays. **Other Considerations:** * **Array Size:** The performance difference between `slice()` and the spread operator can become more noticeable with larger arrays. * **JavaScript Engine:** Different JavaScript engines (like V8 in Chrome or SpiderMonkey in Firefox) may have different optimizations for these methods, so benchmark results can vary. * **Use Case:** If readability is a priority, the spread operator is often preferred. If extremely fine-grained performance is crucial and you're dealing with very large arrays, `slice()` might be slightly more efficient. Let me know if you have any other questions!
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