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access to first item of array via shift, index ([0]), slice
(version: 3)
Comparing performance of:
shift vs by index vs slice
Created:
6 years ago
by:
Registered User
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Script Preparation code:
var name = 'some somewhat long name'
Tests:
shift
name.split(' ').shift()
by index
name.split(' ')[0]
slice
name.split(' ').slice(0, 1)[0]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
shift
by index
slice
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in this benchmark. **What is being tested?** The test cases are measuring the performance of three different ways to access the first item of an array: using the `shift()` method, accessing by index (`[0]`), and using the `slice()` method with a slice of `[0, 1]`. In essence, these tests are comparing the efficiency of these three approaches in JavaScript. **Options compared** The options being compared are: * `shift()`: This method removes the first element from the array and returns it. It's a convenient way to access the first item, but it can be slower than other methods. * Accessing by index (`[0]`): This is a straightforward way to access the first item of an array. However, if the array is empty or not a valid array, this will throw an error. * `slice()` with a slice of `[0, 1][0]`: This method returns a new array containing the first element of the original array. It's a more explicit way to access the first item. **Pros and cons of each approach** * `shift()`: + Pros: Convenient, easy to read. + Cons: Can be slower than other methods due to the removal operation. * Accessing by index (`[0]`): + Pros: Fast, straightforward. + Cons: Throws an error if the array is empty or not a valid array. * `slice()` with a slice of `[0, 1][0]`: + Pros: Fast, explicit way to access the first item. + Cons: May be less readable than other methods. **Library and syntax used** In this benchmark, no specific libraries are being tested. However, the tests do use JavaScript syntax that's widely available in most modern browsers. No special JavaScript features or syntax are being used beyond what's standard for accessing array elements. **Other alternatives** If you wanted to test other ways of accessing the first item of an array, you might consider: * Using a different method, such as `array[0]` (which is equivalent to `[0]`) * Using a custom function or class to extract the first element * Testing access via iteration (`for (var i = 0; i < array.length; i++) { var firstElement = array[i]; }`) * Using a library like Lodash or Ramda, which provide additional utility functions for working with arrays. Keep in mind that the performance differences between these approaches may be small and depend on various factors, such as the specific use case and browser/JavaScript environment.
Related benchmarks:
Slice vs Shift (for 1 element)
slice shift case
`array.slice(-1)[0]` vs `array[array.length - 1]`
shift vs slice 1 element
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