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Which equals operator (== with type coercion vs ===) is faster?
(version: 0)
Is there a performance benefit to replacing == with ===?
Comparing performance of:
test equality with coercion vs test strict equality
Created:
4 years ago
by:
Guest
Go to the latest result
Tests:
test equality with coercion
var n = 0; while(true) { n++; if(n=='100000') break; }
test strict equality
var n = 0; while(true) { n++; if(n===100000) break; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
test equality with coercion
test strict equality
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0
Browser/OS:
Firefox 148 on Linux
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<iframe src="https://measurethat.net/Embed?id=627123" width="100%" height="500px"></iframe>
test equality with coercion
37K/s
test strict equality
32K/s
View exact numbers
Test name
Executions per second
✓
test equality with coercion
36,842 Ops/sec
test strict equality
32,478 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested. **Benchmark Definition** The benchmark is checking which equals operator (`==` vs `===`) is faster, considering type coercion. The question seems to imply that using `===` instead of `==` can provide a performance benefit due to its more precise comparison. However, in modern JavaScript, the difference between these two operators is often negligible. **Options being compared** There are two options being compared: 1. **Equality with coercion (`==`)** 2. **Strict equality (`===`)** **Pros and Cons of each approach:** * **Equality with coercion (`==`):** + Pros: - Widely supported in older browsers and environments. - May be faster due to type coercion, although this is debated. + Cons: - Can lead to unexpected behavior if not careful (e.g., comparing strings with numbers). - Less precise than strict equality. * **Strict equality (`===`):** + Pros: - More precise and predictable. - Better for comparing values without considering types. + Cons: - May be slower due to additional checks. - Not supported in older browsers or environments. **Library used:** In the provided test case, a `while` loop is used to increment a variable (`n`) until it reaches 100,000. No external libraries are mentioned. **Special JS feature or syntax:** None of the provided code uses any special JavaScript features or syntax (e.g., async/await, arrow functions, ES6 classes). **Other considerations:** Keep in mind that this benchmark only tests the performance difference between `==` and `===` operators. In real-world scenarios, it's often better to prioritize code readability and maintainability over minor performance optimizations. **Alternatives:** If you're looking for alternative approaches or want to explore other optimization techniques: * For a more precise comparison, consider using a library like [Benchmark.js](https://www.benchmarkjs.com/). * If you need to compare values without considering types, consider using the ` ===` operator with a type guard (e.g., checking if `n` is an integer before comparing it to 100,000). In conclusion, this benchmark provides insight into the performance difference between `==` and `===` operators in JavaScript. However, for most use cases, the benefits of strict equality (`===`) outweigh any potential performance gains from using coercion (`==`).
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