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Which equals operator (== vs ===) is faster2?
(version: 0)
Is there a performance benefit to replacing == with ===?
Comparing performance of:
test equality vs test strict equality
Created:
6 years ago
by:
Guest
Go to the latest result
Tests:
test equality
var n = 0; while(true) { n++; if(100000==n) break; }
test strict equality
var n = 0; while(true) { n++; if(100000===n) break; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
test equality
test strict equality
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one month ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36
Browser/OS:
Chrome 149 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=629768" width="100%" height="500px"></iframe>
test strict equality
21K/s
test equality
21K/s
View exact numbers
Test name
Executions per second
✓
test strict equality
20,968 Ops/sec
test equality
20,919 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what is being tested, compared, and their pros and cons. **Benchmark Definition** The benchmark definition represents a comparison between two JavaScript operators: `==` (loose equality) and `===` (strict equality). The question asks whether there is a performance benefit to replacing `==` with `===`. **Options Compared** Two options are being compared: 1. **Loose Equality (`==`)**: This operator checks if the values of two variables are equal, without considering their data types. 2. **Strict Equality (`===`)**: This operator checks if both the value and data type of two variables are equal. **Pros and Cons** **Loose Equality (`==`)** Pros: * Faster execution: Loose equality is faster because it only checks the values, not the data types. * More flexible: Loose equality allows for implicit conversions between data types. Cons: * Less reliable: Loose equality can lead to unexpected results due to type coercion. * Security risks: Loose equality can be exploited by attackers to bypass security checks. **Strict Equality (`===`)** Pros: * More reliable: Strict equality ensures that both the value and data type are equal, reducing the risk of unexpected results. * Better security: Strict equality helps prevent security vulnerabilities like DOM-based XSS attacks. Cons: * Slower execution: Strict equality is slower because it checks both the value and data type. * Less flexible: Strict equality requires explicit comparisons between values and types. **Library and Special JS Feature** There is no library used in this benchmark. However, it's worth noting that JavaScript has several special features that might be relevant to this benchmark, such as: * `Number()` function: This function can convert a value to a number, which might affect the performance of loose equality. * Type coercion: JavaScript performs type coercion when using loose equality, which can lead to unexpected results. **Other Alternatives** If you want to measure the performance difference between `==` and `===` in a different context, you could consider using other benchmarking frameworks or libraries. Some popular alternatives include: * Benchmark.js * Microbenchmark * jsperf These tools provide more advanced features and options for customizing your benchmarks. In summary, the provided JSON data tests the performance difference between loose equality (`==`) and strict equality (`===`), highlighting the trade-offs between speed, reliability, and security.
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