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Push element using 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:
3 years ago
by:
Registered User
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; params.push('hi'); var other = params.slice();
spread operator
var params = [ "hello", true, 7 ]; var other = [ ...params, 'hi' ];
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Test case name
Result
Array.prototype.slice
spread operator
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares two ways to add an element ('hi') to the end of an existing array: **1. `Array.prototype.slice()`:** This is the traditional method, using the `slice()` function to create a copy of the original array and then manipulating it. The code for this test case is: `params.push('hi');\r\nvar other = params.slice();` **2. Spread Operator (`...`)**: This is a newer ES6 feature that allows you to expand an array into its individual elements when creating a new array. The code for this test case is: `var other = [ ...params, 'hi' ];` **Pros and Cons:** * **`slice()`:** * **Cons:** Creates a new array copy, which can be inefficient if the original array is large. * **Pros:** Widely understood, has been around for a long time. * **Spread Operator (`...`)**: * **Pros:** More concise syntax, potentially more efficient (depending on how JavaScript engines implement it) as it avoids creating a copy of the entire array. * **Cons:** Newer feature, might not be supported in all environments. **Alternatives:** * **`concat()`:** This method also creates a new array by concatenating existing arrays. It's similar to `slice()` in that it creates a new array but offers more flexibility for combining multiple arrays. * `var other = params.concat('hi');` **Considerations:** * **Performance:** While the benchmark shows slight differences, real-world performance can vary depending on array size and specific use cases. Profiling is recommended for critical applications. * **Readability and Maintainability:** The spread operator can make code more concise and readable. * **Browser Compatibility:** Ensure your target audience's browsers support ES6 features like the spread operator. Let me know if you have any more questions about benchmarks or JavaScript!
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