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joins prescreening details
(version: 0)
Comparing performance of:
using concat vs using spread
Created:
4 years ago
by:
Guest
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Tests:
using concat
let newDetails = []; const slikDetail = [{ preScreenDetailId: 1, type: 'SLIK', status: 'SLIK_DRAFT', refNumberForCBAS: null }]; const duckapilDetail = [{ preScreenDetailId: 2, type: 'DUKCAPIL', status: 'REQUEST_FAILED', refNumberForCBAS: null }]; newDetails = newDetails.concat(slikDetail, duckapilDetail);
using spread
const newDetails = []; const slikDetail = [{ preScreenDetailId: 1, type: 'SLIK', status: 'SLIK_DRAFT', refNumberForCBAS: null }]; const duckapilDetail = [{ preScreenDetailId: 2, type: 'DUKCAPIL', status: 'REQUEST_FAILED', refNumberForCBAS: null }]; newDetails.push(...slikDetail, ...duckapilDetail);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
using concat
using spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what is being tested. **Benchmark Definition** The benchmark definition represents two different approaches to concatenate arrays in JavaScript: 1. **Using `concat()`**: The first test case uses the `concat()` method to merge two arrays: `slikDetail` and `duckapilDetail`. The resulting array is assigned to a new variable, `newDetails`. 2. **Using spread operator (`...`)**: The second test case uses the spread operator (`...`) to merge the two arrays in a more concise way. Instead of assigning the result to a new variable, it directly modifies the `newDetails` array. **Options being compared** The benchmark is comparing the performance of these two approaches on different JavaScript engines and platforms. **Pros and Cons of each approach:** 1. **Using `concat()`**: * Pros: Easy to read and understand, widely supported. * Cons: Can be slower than spread operator due to the creation of a new array object, which can lead to memory allocation overhead. 2. **Using spread operator (`...`)**: * Pros: More concise and readable, as it modifies the original array instead of creating a new one. * Cons: May not be supported in older browsers or environments. **Library used** There is no explicit library mentioned in the benchmark definition or test cases. However, JavaScript engines like V8 (used by Chrome) may have internal optimizations that can affect performance. **Special JS feature or syntax** The spread operator (`...`) is a relatively recent addition to JavaScript, introduced in ES6 (ECMAScript 2015). It allows for more concise and expressive code, but may not be supported in all browsers or environments. **Other alternatives** If you were to consider alternative approaches, you might also look at: 1. **Using `push()` and `shift()`**: Instead of concatenating arrays, you could use `push()` and `shift()` to add elements to the end of an array. 2. **Using `Array.prototype.reduce()`**: You could use `reduce()` to merge two arrays by reducing them to a single value. However, these alternatives might not be as concise or readable as using spread operator (`...`) or `concat()`.
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