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spread vs push 12321321311122
(version: 0)
Comparing performance of:
push vs spread
Created:
7 years ago
by:
Guest
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Tests:
push
const sourceArray = [{a: {b: {c: '123'}}}]; const testObj = {a: {b: {c: '12333'}}}; sourceArray.push(testObj);
spread
const sourceArray = [{a: {b: {c: '123'}}}]; const testObj = {a: {b: {c: '12333'}}}; const newArray = [...sourceArray, testObj];
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Suite status:
<idle, ready to run>
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Test case name
Result
push
spread
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in the provided benchmark and the different approaches compared. The benchmark measures the performance of two ways to add an object to an array: using the `push()` method and using the spread operator (`...`). The test case is designed to create a nested object structure, where each level has multiple properties with nested objects. This will help isolate the overhead of adding a new object to the end of the array versus creating a new copy of the array. **Push() Method:** The `push()` method adds a new element to the end of an array. In this case, it's used to add the `testObj` object to the `sourceArray`. The pros of using `push()` are: * It modifies the original array in place. * It's often faster for small arrays since it only requires updating the array's length property. However, there are some cons: * For large arrays, `push()` can be slower than creating a new copy of the array because it involves shifting all existing elements down to make room for the new one. This can lead to performance issues if the array grows rapidly. * It doesn't create a new copy of the original data, which means that any modifications made to the `testObj` will also affect the original `sourceArray`. **Spread Operator (...):** The spread operator creates a new copy of an array by iterating over its elements and copying them into a new array. In this case, it's used to create a new array with the `sourceArray` followed by the `testObj`. The pros of using the spread operator are: * It creates a new copy of the original data, which means that any modifications made to the `testObj` will not affect the original `sourceArray`. * It can be faster for large arrays since it avoids the overhead of shifting elements down. However, there are some cons: * It creates a new array and copies all its elements, including nested objects. * It may involve more memory allocation than using `push()`, especially if the array grows rapidly. **Library Used:** The benchmark doesn't explicitly mention any libraries being used. However, based on the code snippets provided, it's likely that the JavaScript engine being tested is using some internal implementation details of the language, such as the V8 engine in Chrome or SpiderMonkey in Firefox. **Special JS Feature/Syntax:** There are no special features or syntaxes explicitly mentioned in the benchmark. However, the use of template literals (`\r\nconst sourceArray = [...sourceArray, testObj];`) is an example of a modern JavaScript feature that allows for more readable code by avoiding explicit concatenation. **Other Alternatives:** If you were to modify the benchmark to compare other approaches, here are some options: * Using `concat()` instead of the spread operator. * Creating a new array and pushing elements onto it, similar to using `push()`. * Using a library like Lodash or Ramda to perform the addition. * Using a different data structure, such as a linked list, to compare performance with arrays. Keep in mind that these alternatives would likely change the benchmark's behavior significantly and might not be representative of real-world use cases.
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