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Which cmp operator (== vs === vs >) is faster?
(version: 0)
Comparing performance of:
test equality vs test strict equality vs test ineq vs test ineq2
Created:
4 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; }
test ineq
var n = 0; while(true) { n++; if(n>99999) break; }
test ineq2
var n = 0; while(true) { n++; if(n>=100000) break; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Test case name
Result
test equality
test strict equality
test ineq
test ineq2
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
The provided JSON represents a JavaScript benchmark test on the MeasureThat.net website. The test aims to compare the performance of three different comparison operators: `==`, `===`, and `>`. Let's break down what each option is being compared, along with their pros and cons. **Comparison Operators:** 1. **`==` ( Loose Equality ):** * Pros: Simple and easy to read. * Cons: Can lead to unexpected results due to type coercion. * Purpose: Tests if the two values are equal in value, but not necessarily of the same data type. 2. **`===` ( Strict Equality ):** * Pros: Ensures that both the value and data type of the operands match. * Cons: Can lead to slower performance due to the additional checks required. * Purpose: Tests if the two values are equal in both value and data type. 3. **`>` ( Inequality ):** * Pros: Fastest comparison operator, as it only checks for equality. * Cons: May not be suitable for all use cases, as it doesn't check for strict inequality. **Other Considerations:** * The `while(true)` loop used in the benchmark definitions can lead to high execution counts and slow performance if not optimized properly. In this case, it seems that the loops are set up to run indefinitely, which helps maintain consistency across different browsers. * The use of `var n = 0;` and incrementing `n++` is a common pattern in JavaScript for creating simple iterations. **Library Usage:** There is no explicit library mentioned in the provided JSON. However, some libraries might be used indirectly due to their widespread adoption or inclusion in the benchmarked codebases. For example, the `Safari 14` browser might be using its built-in JavaScript engine, which could have certain optimizations or features. **Special JS Features/Syntax:** There are no special JavaScript features or syntax mentioned in the provided JSON that require specific handling. However, it's essential to note that some JavaScript engines, like SpiderMonkey (used by Firefox), have unique performance characteristics and optimization techniques that might affect benchmark results. Now, regarding the alternatives: * **Alternative comparison operators:** Other comparison operators available in JavaScript include `<=`, `>=`, `<`, `>`, `===` (strict equality), and `!==` (not equal). Each has its own use cases and potential performance implications. * **Different benchmarking strategies:** There are various approaches to benchmarking, such as: + Measuring execution time: Measures the time taken for a specific operation or code block. + Measuring throughput: Measures the number of operations performed within a given timeframe. + Using benchmarking libraries like Benchmark.js or js-benchmark * **Browser-specific optimizations:** Different browsers have their unique performance characteristics, and optimization techniques can be browser-agnostic. However, understanding these differences is crucial for creating efficient and optimized JavaScript code. Keep in mind that the MeasureThat.net website provides a convenient platform for comparing different comparison operators and testing various JavaScript scenarios, allowing developers to quickly identify performance differences and optimize their code accordingly.
Related benchmarks:
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Which equals operator (== vs ===) is faster?
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Which equals operator (== vs ===) is faster2?
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