Benchmark: Which equals operator (== vs ===) is faster (different types)?

Tests:

test equality
var n = 0; while(n <= 100001) { n++; if(n=="100000") break; }
test strict equality
var n = 0; while(n < 100001) { n++; if(n==="100000") break; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test equality
test strict equality

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
test equality	3223.1 Ops/sec
test strict equality	26591.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**What is being tested?**

The benchmark measures the performance difference between two types of comparison operators: `==` (loose equality) and `===` (strict equality). The test cases use different variable declarations, which affect how the JavaScript engine evaluates these comparisons.

In summary, we're comparing:

1. Loose equality (`==`) using a number variable (`var n = 0;`)
2. Strict equality (`===`) using a string literal in a numerical context (`if(n==\"100000\")`)

**Options being compared**

The benchmark is testing two approaches:

1. **Loose Equality (`==`)**
	* Pros: Simple, widely supported by browsers.
	* Cons:
		+ Can lead to unexpected behavior due to type coercion.
		+ May not perform as well as strict equality.
2. **Strict Equality (`===`)**
	* Pros: More predictable, better performance.
	* Cons:
		+ Less supported by older browsers (pre-ES6).
		+ Requires explicit declaration of variable types.

**Other considerations**

The benchmark doesn't account for other factors that might affect the outcome, such as:

* The number of iterations in the loop
* Memory allocation and deallocation during each iteration
* Garbage collection frequency

Keep in mind that these variations might impact the results.

**Library usage**

None. This benchmark doesn't use any external libraries.

**Special JavaScript features or syntax**

This benchmark uses:

1. **ES6 strict equality (`===`)**: The comparison operator `==` is replaced with `===`, which ensures that both operands are of the same type.
2. **Type coercion**: In the loose equality test, the string literal `"100000"` is compared to a number variable `n`. This can lead to unexpected behavior due to type coercion.

**Other alternatives**

To create a similar benchmark, you could consider testing other comparison operators or scenarios, such as:

* Loose and strict equality with different data types (e.g., strings, numbers, booleans)
* Equality comparisons in more complex contexts, like object comparisons
* Comparison performance under different CPU architectures or caching mechanisms

Related benchmarks:

Which equals operator (== vs ===) is faster (different types)? (version: 0)

Is there a performance benefit to replacing == with ===?

Comparing performance of: test equality vs test strict equality

Created: one year ago by: Guest

Jump to the latest result

test equality

test strict equality

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):