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Array.prototype.slice vs spread operator with find and array of tuples with reverse
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method with extra data
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
4 years ago
by:
Guest
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Tests:
Array.prototype.slice
const params = [ [0, "fda0s"],[2, "fda2s"],[3, "fda3s"],[4, "fda4s"],[5, "fda5s"],[6, "fda6s"],[7, "fda7s"],[8, "fda8s"],[9, "fda9s"] ]; var lastArray = []; for (let i=0; i<101; i++){ lastArray.push(params.slice().reverse().find(x => x[0]<=i)[1]) }
spread operator
const params = [ [0, "fda0s"],[1, "fda1s"],[2, "fda2s"],[3, "fda3s"],[4, "fda4s"],[5, "fda5s"],[6, "fda6s"],[7, "fda7s"],[8, "fda8s"],[9, "fda9s"] ]; var lastArray = []; for (let i=0; i<101; i++){ lastArray.push([...params].reverse().find(x => x[0]<=i)[1]) }
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Test case name
Result
Array.prototype.slice
spread operator
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents two benchmark definitions: `Array.prototype.slice vs spread operator with find and array of tuples with reverse`. These benchmarks aim to compare the performance of the traditional `slice()` method with the new ES6 spread operator (`...`) in handling large arrays. **Options Compared** The two options being compared are: 1. **`Array.prototype.slice()`**: The traditional method for creating a shallow copy of an array. 2. **Spread Operator (`...`)**: A new syntax introduced in ECMAScript 2015, which allows creating a new array by spreading the elements of an existing array. **Pros and Cons** * **`Array.prototype.slice()`**: + Pros: Widely supported and well-established method. + Cons: Can be slower for large arrays due to the overhead of creating a new array and handling bounds checking. * **Spread Operator (`...`)**: + Pros: More concise and expressive syntax, can handle large arrays more efficiently using `Array.prototype.slice()`. + Cons: Less widely supported (although becoming increasingly common) and may not perform as well on older browsers or systems. **Library** In the provided benchmark definitions, no specific library is used. The focus is solely on comparing the performance of these two methods. **Special JS Feature/Syntax** The spread operator (`...`) is a relatively recent addition to JavaScript (introduced in ECMAScript 2015). It's designed to make working with arrays and objects more concise and expressive. When used with `Array.prototype.slice()`, it can create a new array by spreading the elements of an existing array, which can be more efficient for large datasets. **Other Considerations** When comparing these two methods, consider the following: * **Browser Support**: While the spread operator is widely supported in modern browsers, older browsers may not support it. Ensure your target audience has up-to-date browser versions. * **Array Size**: The performance difference between `slice()` and the spread operator will be more noticeable with large arrays. If you're working with small datasets, the difference might be negligible. **Alternatives** If you need alternative methods for creating copies of arrays or handling array manipulation, consider: 1. **`Array.prototype.concat()`**: Another method for creating a new array by concatenating existing arrays. 2. **`Array.prototype.map()`**: A method for creating a new array with the results of applying a provided function to each element in the original array. 3. **Libraries like Lodash** or **Underscore.js**, which provide more functional programming utilities, including array manipulation functions. These alternatives may offer better performance, conciseness, or readability depending on your specific use case and requirements.
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