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pop vs length-1
(version: 0)
Comparing performance of:
pop vs length
Created:
8 years ago
by:
Registered User
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Script Preparation code:
var a = [1,2,3,4,6,5] var last = a.length-1;
Tests:
pop
var b = a.pop()
length
var c = a[last]; a.length = last;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
pop
length
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares two ways to remove the last element from an array in JavaScript: **Option 1: `pop()` method:** This method directly removes the last element of an array and returns it. * **Benchmark Definition:** `var b = a.pop();` * **Pros:** Concise, built-in functionality, efficient for removing a single element. * **Cons:** Mutates the original array (changes its length). **Option 2: Index access and length manipulation:** This approach accesses the last element using its index (`a[last]`) and then reduces the array's length using `a.length = last;`. * **Benchmark Definition:** `var c = a[last];\r\na.length = last;` * **Pros:** Doesn't directly modify the array, allowing for potential reuse of the removed element if needed. * **Cons:** More verbose than `pop()`, potentially less efficient as it involves two separate operations. **Other Considerations:** In this specific benchmark, the `pop()` method is significantly faster. This is likely due to JavaScript engines being optimized for the `pop()` method's direct array manipulation. **Alternatives:** * **Slice:** You could create a new array excluding the last element using `a.slice(0, -1)`. While functional, this creates a new array instead of modifying the original. The choice between these methods depends on your specific needs: * If you need to remove the last element and don't require keeping it for further use, `pop()` is generally the most efficient and concise option. * If you need to retain the removed element or want more control over the modification process, using index access and length manipulation might be preferable, though potentially less performant.
Related benchmarks:
poppin and stuff
get element from array = [0] vs pop()
pop vs index for array
Last element slice vs pop
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