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Javascript slice, splice, pop, unshift fixed
(version: 0)
Comparing performance of:
slice vs splice vs pop vs unshift
Created:
4 years ago
by:
Guest
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Tests:
slice
const rainbow = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']; const sliced = rainbow.slice(4,5)
splice
const rainbow = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']; const spliced = rainbow.splice(4,1)
pop
const rainbow = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']; const popped = rainbow.pop()
unshift
const rainbow = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']; const unshifted = rainbow.unshift()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Test case name
Result
slice
splice
pop
unshift
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark measures the performance of different JavaScript operations on arrays: `slice`, `splice`, `pop`, and `unshift`. The benchmark tests how fast these operations can be executed in different browsers (in this case, only Firefox 115) using various devices (desktop). **Options Compared** The four options compared are: 1. **`slice`**: Returns a shallow copy of a portion of an array. 2. **`splice`**: Removes or replaces elements in an array and returns the number of elements removed or replaced. 3. **`pop`**: Removes the last element from an array and returns it. 4. **`unshift`**: Adds one or more elements to the beginning of an array. **Pros and Cons of Each Approach** * **`slice`**: This operation creates a new array with the specified elements. It is generally faster than other operations because it only needs to create a new array, which requires less memory allocation and copying. * Pros: Efficient use of memory and fast execution time. * Cons: Creates a new array, which may not be desirable for large arrays or systems with limited memory. * **`splice`**: This operation modifies the original array by removing or replacing elements. It can also return the number of elements removed or replaced. * Pros: Modifies the original array in-place, reducing memory allocation and copying. * Cons: Slower execution time compared to `slice`, especially for large arrays. * **`pop`**: This operation removes the last element from an array and returns it. It is similar to `splice` but only modifies the top element of the stack. * Pros: Efficient use of memory and fast execution time, as it only needs to access the last element. * Cons: Only works with arrays that have at least one element. * **`unshift`**: This operation adds one or more elements to the beginning of an array. It is similar to `splice` but only modifies the top element of the stack. * Pros: Efficient use of memory and fast execution time, as it only needs to access the first elements. * Cons: Only works with arrays that have enough space for additional elements. **Library Usage** In this benchmark, there are no libraries explicitly mentioned. However, JavaScript's built-in `Array` object is used throughout the tests. **Special JS Features or Syntax** None of the test cases use any special JavaScript features or syntax beyond basic array operations. **Alternatives** Other alternatives for implementing these operations include: * **Using native methods**: Depending on the browser and platform, some operations like `slice`, `splice`, `pop`, and `unshift` are implemented in native code. Using these methods might be faster than using JavaScript. * **Using custom implementations**: You can implement these operations yourself using loops or recursion. However, this approach is likely to be slower due to the overhead of manual memory management and copying. **Benchmark Preparation Code** The provided `Script Preparation Code` section is empty, suggesting that no specific setup code is required for running these tests. The benchmark definition and test cases are self-contained, making it easy to reproduce them without additional configuration.
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