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Which equals operator (== vs ===) is faster?
(version: 0)
Is there a performance benefit to replacing == with ===?
Comparing performance of:
test equality vs test strict equality vs string to int
Created:
7 years ago
by:
Guest
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Tests:
test equality
var n = 0; while(true) { n++; if(n==100000) break; }
test strict equality
var n = 0; while(true) { n++; if(n===100000) break; }
string to int
var n = 0; while(true) { n++; if(n=='100000') break; }
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Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
test equality
test strict equality
string to int
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark investigates the performance difference between using the loose equality operator (`==`) and the strict equality operator (`===`) in JavaScript. **Here's a breakdown:** * **Test Cases:** * **`test equality`**: Compares an integer with another integer using `==`. * **`test strict equality`**: Does the same comparison but uses `===`, which checks both value and data type. * **`string to int`**: Compares an integer to a string representation of the same number (`'100000'`), highlighting the potential for unexpected behavior with loose comparison. * **Options Compared:** * The primary options are `==` (loose equality) and `===` (strict equality). Loose equality performs type coercion, meaning it might convert values to a common type before comparison. Strict equality demands both value and type match. * **Pros and Cons:** * **`==`**: * **Pro**: Can be more convenient when you're not strictly concerned about data types, as it handles type conversions automatically. * **Con**: Can lead to unexpected results due to type coercion. This can make your code harder to debug and understand. * **`===`**: * **Pro**: Enforces strict equality checks, making your code more predictable and less prone to subtle bugs caused by type coercion. * **Con**: Might require explicit type conversions if you need to compare values of different types. **Key Considerations:** * **Readability and Maintainability:** `===` generally improves code readability because its behavior is clearer and less prone to surprises. * **Potential Performance Impact:** While the performance difference between `==` and `===` is usually negligible, it's worth considering in scenarios where performance is critical. In most cases, the benefits of using `===` outweigh any minor performance differences. **Alternatives:** The benchmark doesn't explore alternatives, but depending on the specific use case, you might consider: * **Type Guards**: If you're dealing with complex type systems (e.g., TypeScript), type guards can help ensure that values are used in a compatible manner. Let me know if you have any other questions!
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