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Slice vs Spread -kathir
(version: 0)
Comparing performance of:
slice vs spread
Created:
6 years ago
by:
Guest
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Tests:
slice
var a = []; a.length = 100000; console.time('slice'); console.log("slice:", a.slice()); console.timeEnd('slice');
spread
var a = []; a.length = 100000; console.time('spread'); console.log("spread:", [...a]); console.timeEnd('spread');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
slice
spread
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's being tested. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmarking test case. It consists of two individual tests: `slice` and `spread`. **What is being tested?** The two tests are designed to compare the performance of two different approaches: 1. **Array slicing**: The `slice()` method creates a new array containing a subset of elements from the original array. 2. **Spread operator**: The spread operator (`...`) creates a new array by spreading the elements of the original array. **Options compared** The benchmark is comparing the execution time of these two approaches on an empty array with 100,000 elements. **Pros and Cons** * **Array slicing**: + Pros: Can be more intuitive and easier to read for some developers. + Cons: Creates a new array, which can be memory-intensive and slower than the spread operator. * **Spread operator**: + Pros: More concise and efficient way to create a new array from an existing one. + Cons: May be less intuitive or readable for some developers. **Library and purpose** There is no library being used in this benchmark. The tests are standalone JavaScript functions that use the `console.time()` and `console.timeEnd()` methods to measure execution time. **Special JS feature or syntax** The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and allows for more concise array creation. It's a relatively modern feature, so it might not be supported by older browsers or environments. **Other alternatives** If you wanted to implement this benchmark without using the `slice()` method, you could also use: * `Array.prototype.slice.call()`: This method calls the `slice()` method on an array-like object and returns a new array. * Manual looping: You could write a loop that iterates over the elements of the original array and creates a new array by pushing each element onto a new array. However, these alternatives would likely be slower and less efficient than using the `slice()` or spread operator methods.
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