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Small array Spread vs Array From
(version: 0)
Same bench as arrayfrom-vs-spread with little array
Comparing performance of:
Array from vs Spread
Created:
4 years ago
by:
Guest
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Tests:
Array from
var fooSet = new Set(); for(var i=0;i<10;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<10;i++) { fooSet.add(i); } var other = [...fooSet];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array from
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **What is being tested?** The provided JSON represents two test cases: `Array from` and `Spread`. These tests compare the performance of creating an array by spreading a set object versus using the `Array.from()` method. **Options compared:** There are two options being compared: 1. **Spreading a set object**: This approach creates a new array by spreading the elements of a set object (`var other = [...fooSet];`). 2. **Using Array.from() method**: This approach uses the `Array.from()` method to create an array from the set object (`var other = Array.from(fooSet);`). **Pros and Cons:** * **Spreading a set object**: + Pros: - Simple and concise syntax. - Does not require creating an additional iterator or function. + Cons: - May be slower due to the overhead of spreading the elements. - May require more memory allocation for the new array. * **Using Array.from() method**: + Pros: - Can be faster since it uses a built-in function optimized for performance. - Does not require creating an additional iterator or function. + Cons: - Requires knowledge of the `Array.from()` method, which may lead to slower execution time if not recognized. **Other considerations:** * **Memory allocation**: Creating an array by spreading a set object can lead to more memory allocation since each element in the new array requires its own slot. In contrast, using `Array.from()` method allocates memory for the entire array at once. * **Cache locality**: The performance of these operations may also depend on cache locality, as JavaScript engines try to optimize code for better performance. **Library and purpose:** None is mentioned in this specific benchmark definition. **Special JS features or syntax:** There are no special features or syntax used in these test cases. They rely solely on standard JavaScript concepts. **Alternatives:** If you're interested in comparing other approaches, here are a few alternatives: * **Using Array.from() method with an iterator**: Instead of creating the array directly from the set object, you could use an iterator to create the array (`var other = [...fooSet[Symbol.iterator]().values()]`). * **Spreading individual elements instead of using spread syntax**: You can also try spreading individual elements instead of using the spread syntax (`var other = [fooSet.values()[0], fooSet.values()[1], ...]`) * **Using a for...of loop to create the array**: Another alternative is using a `for...of` loop to create an array from the set object (`var other = []; for (const element of fooSet) { other.push(element); }`) Keep in mind that these alternatives may have varying performance characteristics and should be tested individually.
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