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Large arrays spread vs push v3
(version: 0)
Comparing performance of:
spread vs push
Created:
4 years ago
by:
Guest
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Tests:
spread
const user = {}; user.numbers = Array.from(Array(10000).keys()); for (let i=0; i<1000; i+=1) user.numbers = [...user.numbers, 10000 + i];
push
const user = {}; user.numbers = Array.from(Array(10000).keys()); for (let i=0; i<1000; i+=1) user.numbers.push(10000 + i);
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Suite status:
<idle, ready to run>
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Test case name
Result
spread
push
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 provided benchmark and explain what is being tested, compared options, pros and cons of each approach, and other considerations. **Benchmark Definition** The benchmark definition specifies two test cases: 1. "spread": This test case creates an array `numbers` with 10,000 elements using `Array.from(Array(10000).keys())`. Then, it appends 1,000 more numbers to the array using the spread operator (`...`) in a loop. 2. "push": This test case is similar to the "spread" test case, but instead of using the spread operator, it uses the `push()` method to append elements to the array. **Options Compared** The two options being compared are: 1. **Spread Operator (`...`)**: This operator creates a new array by copying elements from an existing array. 2. **Push Method**: This method adds one or more elements to the end of an array. **Pros and Cons of Each Approach** **Spread Operator (`...`)** Pros: * Creates a shallow copy of the original array, which can be beneficial for performance if the original array is large. * Can be more efficient than using `push()` because it avoids the overhead of function calls and array resizing. Cons: * Requires a new array to be created, which can lead to increased memory usage. * Can be slower than using `push()` when the number of elements being appended is small. **Push Method** Pros: * Does not create a new array, which can reduce memory usage. * Can be faster than using the spread operator because it avoids the overhead of creating a new array. Cons: * Modifies the original array by adding new elements to its end. * Can lead to slower performance if the original array is large or needs to be resized frequently. **Other Considerations** Both options have their trade-offs in terms of memory usage and performance. The spread operator can create a shallow copy of the original array, which can be beneficial for performance, but it also requires more memory allocation. On the other hand, the push method modifies the original array, which can lead to slower performance if the array is large. **Library or Special JS Feature** None are used in this benchmark. **Other Alternatives** Some alternative approaches that could be tested in a similar benchmark include: * Using `Array.prototype.concat()` instead of the spread operator. * Using `Array.prototype.unshift()` instead of the push method. * Creating an array and then using a loop to append elements (e.g., `let arr = []; for (let i = 0; i < 10000; i++) { arr.push(i); }`). Keep in mind that these alternatives may not accurately represent real-world use cases, but they could provide additional insights into the performance characteristics of different array manipulation techniques.
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