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Push vs Length&Fill
(version: 0)
to allocate a array with the right allocated size, which one is the fastest ?
Comparing performance of:
push vs Length & Fill
Created:
2 years ago
by:
Guest
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Tests:
push
for (let n = 0; n < 100; ++n) { let arr = [] for (let i = 0; i < 10000; ++i) { arr.push(-0) } }
Length & Fill
for (let n = 0; n < 100; ++n) { let arr = [] arr.length = 10000 arr.fill(-0) }
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
push
Length & Fill
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 JSON and explain what's being tested. **Benchmark Definition** The benchmark definition is the core of the test, which asks: "To allocate an array with the right allocated size, which one is the fastest?" In this case, there are two approaches: 1. **Push**: This method creates a new empty array `arr` and then uses `push()` to add 10,000 elements of value `-0`. 2. **Length & Fill**: This method creates an empty array `arr`, sets its length to 10,000, and then fills the entire array with values `-0`. **Options Compared** The two approaches differ in how they manage memory allocation: * Push allocates a new array each time it's called, which can be slower due to the overhead of creating a new object. * Length & Fill preallocates an array with the desired length and then fills it with values, which can be faster since it avoids the overhead of repeated array allocations. **Pros and Cons** Pros of Push: * Easier to implement and understand for developers who are familiar with arrays in JavaScript * No need to worry about memory allocation or bounds checking Cons: * May incur additional overhead due to repeated array allocations * Can lead to slower performance on large datasets Pros of Length & Fill: * Can be faster since it avoids repeated array allocations * Allows for better control over memory usage and caching Cons: * Requires more effort to implement and understand, especially when dealing with arrays of large sizes * May require additional consideration for handling edge cases or errors **Library** None. **Special JS Feature/Syntax** There are no special features or syntax used in these test cases. They only utilize standard JavaScript features like arrays, loops, and operators. **Alternatives** Other alternatives to benchmarking array allocation performance include: * Using a library like `fast-string` which can measure the performance of creating an empty string. * Creating a simple data structure using objects or maps instead of arrays. * Measuring the performance of iterating over large datasets using different methods (e.g., `forEach`, `for...in`, etc.). * Comparing the performance of different JavaScript engines or versions. Keep in mind that these alternatives might not directly address the specific question being asked, but they can provide additional insights into the performance characteristics of different JavaScript features and techniques.
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