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Spread operator vs. slice small real
(version: 0)
Creating a "new" array reference every time
Comparing performance of:
Spread operator vs Slice()
Created:
7 years ago
by:
Guest
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Tests:
Spread operator
var n = []; while(true) { n.push('asdf'); n = [...n]; if(n.length >= 10000) break; }
Slice()
var n = []; while(true) { n.push('asdf'); n = n.slice(); if(n.length >= 10000) break; }
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Spread operator
Slice()
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 Overview** The test compares two approaches to create a new array reference: using the spread operator (`[...]`) and using `slice()`. The goal is to determine which approach is faster for creating a large array of 10,000 elements. **Options Compared** There are only two options compared in this benchmark: 1. **Spread Operator (`[...]`)**: This creates a new array reference by spreading the elements of an existing array. 2. **Slice()**: This returns a shallow copy of a portion of an array. **Pros and Cons** * **Spread Operator (`[...]`)**: + Pros: More concise, can be used to create arrays with dynamic sizes. + Cons: May have performance overhead due to the creation of a new array reference. * **Slice()**: + Pros: Can be used to create arrays with specific ranges or offsets. + Cons: Requires specifying the start and end indices, which can make it less convenient for creating large arrays. **Library/ Framework** Neither of the options in this benchmark uses any external library or framework. The test is primarily focused on comparing the performance of these two built-in JavaScript operators. **Special JS Feature/Syntax** There are no special features or syntax used in this benchmark that would require knowledge beyond basic JavaScript programming. **Other Alternatives** If you wanted to create a large array using other methods, some alternatives could include: * Using `Array.from()` with an iterable source (e.g., an array of promises) * Using `concat()` to concatenate multiple arrays * Using a loop to push elements onto an existing array However, these alternatives are not relevant to the specific benchmark being compared. Overall, this benchmark provides a simple and concise way to compare the performance of two built-in JavaScript operators: the spread operator and `slice()`.
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