Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Which equals operator (== vs ===) is faster? with object.is
(version: 0)
Is there a performance benefit to replacing == with ===?
Comparing performance of:
test equality vs test strict equality vs object.is
Created:
4 years ago
by:
Guest
Jump to the latest result
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; }
object.is
var n = 0; while(true) { n++; if(Object.is(n, 100000)) break; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
test equality
test strict equality
object.is
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Definition** The provided JSON defines a benchmark that compares the performance of three different approaches to equality checking in JavaScript: 1. `==` (loose equality) 2. `===` (strict equality with type coercion) 3. `Object.is()` (from the `lodash` library) **What is being tested?** In this benchmark, we're measuring the execution speed of a simple loop that increments a variable until it reaches 100,000. The only difference between the three test cases is how equality is checked: 1. **Test equality**: `n == 100000` 2. **Test strict equality**: `n === 100000` 3. **object.is**: `Object.is(n, 100000)` **Options comparison** The benchmark compares these three approaches to see which one is faster. **Pros and Cons of each approach:** 1. **`==` (loose equality)**: * Pros: Simple and widely supported. * Cons: Can lead to unexpected behavior due to type coercion, e.g., `0 == "0"` returns true. 2. **`===` (strict equality with type coercion)**: * Pros: More explicit and safe than loose equality. * Cons: May perform additional type checks, which can be slower. 3. **`Object.is()`**: * Pros: Fast and efficient, using a specialized implementation that avoids JavaScript's normal equality checks. * Cons: Requires the `lodash` library to be included in the test environment. **Library usage** The benchmark uses the `lodash` library for the `Object.is()` function. The purpose of this function is to provide a fast and efficient way to compare two values without performing type coercion or other unnecessary operations. **Special JS features or syntax** None mentioned in the provided JSON, but it's worth noting that some modern JavaScript engines, like V8 (used by Chrome), have optimized equality checks for primitive types using a technique called "hash collisions." This optimization can improve performance for specific use cases. However, this is not directly related to the benchmark being tested. **Alternatives** If you want to create similar benchmarks or tests, here are some alternatives: * For simple equality checks: Use `strict equality` (`===`) instead of `loose equality` (`==`). * For fast and efficient equality checks: Consider using a library like `lodash` or a specialized implementation like the one used in the benchmark. * To measure performance: You can use a JavaScript profiling tool, like WebPageTest or jsPerf, to run multiple iterations of your benchmark and compare results.
Related benchmarks:
Which equals operator (== vs ===) is faster?
Which equals operator (== vs ===) is faster?
Which equals operator (== vs ===) is faster2?
Which equals operator (== vs === vs Object.is) is faster?
Comments
Confirm delete:
Do you really want to delete benchmark?