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const arr = [1,2,3]; const res = !!arr.lenght;
(version: 0)
Comparing performance of:
const arr = [1,2,3]; const res = !!arr.lenght; vs const arr = [1,2,3]; const res = arr.lenght > 0;
Created:
5 years ago
by:
Guest
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Tests:
const arr = [1,2,3]; const res = !!arr.lenght;
const arr = [1,2,3]; const res = !!arr.lenght;
const arr = [1,2,3]; const res = arr.lenght > 0;
const arr = [1,2,3]; const res = arr.lenght > 0;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
const arr = [1,2,3]; const res = !!arr.lenght;
const arr = [1,2,3]; const res = arr.lenght > 0;
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON data and explain what's being tested in each benchmark. **Benchmark Definition** The `Benchmark Definition` is a JavaScript expression that defines a small program to be executed multiple times. In this case, there are two benchmarks: 1. `const arr = [1,2,3]; const res = !!arr.lenght;` - This benchmark creates an array `arr` with three elements and then checks if the length of `arr` is truthy using the double-not operator (`!!`). The result will be either `true` or `false`. 2. `const arr = [1,2,3]; const res = arr.lenght > 0;` - This benchmark creates an array `arr` with three elements and then checks if the length of `arr` is greater than zero using a simple comparison. **Options Compared** In both benchmarks, the only difference is in how the length of the array is accessed: 1. The first benchmark uses the double-not operator (`!!`) to check the truthiness of the length. 2. The second benchmark uses a simple comparison (`arr.lenght > 0`). **Pros and Cons** ### Double-Not Operator (`!!`) Pros: * Concise and expressive way to check if a value is truthy (i.e., not null, undefined, or zero). * Can be useful for readability when checking the existence of an array. Cons: * May be slower than simple comparisons due to its syntax and potential parsing overhead. * Can lead to unexpected behavior if the variable being checked has a special meaning in the context. ### Simple Comparison (`arr.length > 0`) Pros: * Fastest way to check if an array has at least one element. * Directly checks for the presence of elements without involving any operators or potential parsing overhead. Cons: * Requires knowledge of the `length` property and its behavior with arrays. * May not be as concise or readable in some cases. **Other Considerations** - Both approaches assume that the array has a defined length. If the array is empty, both expressions will evaluate to false. ### Library Usage None of the provided benchmarks use any external libraries. However, if we were to consider the `length` property, it's worth noting that some JavaScript engines or browsers might have different behavior when accessing this property. **Special JS Features or Syntax** - Neither benchmark uses any special JavaScript features or syntax beyond standard JavaScript syntax for arrays and comparisons.
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