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

Tests:

test equality
var n = 0; var t = []; while(true) { t[n] = n; n++; if(n==100000) break; } n = 0; while(true){ n++; t.shift(); if(n==100000) break; }
test strict equality
var n = 0; var t = []; while(true) { t[n] = n; n++; if(n===100000) break; } n = 0; while(true){ n++; t.pop(); 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

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**Benchmark Purpose:**
The purpose of this benchmark is to compare the performance differences between using the loose equals operator (`==`) versus the strict equals operator (`===`) in JavaScript.

**Options Being Compared:**

1. **Loose Equals Operator (`==`)**: This operator checks if both operands are equal, considering type conversions and string concatenation.
2. **Strict Equals Operator (`===`)**: This operator checks if both operands are equal, without performing any type conversions or string concatenations.

**Pros and Cons of Each Approach:**

* Loose Equals Operator (`==`):
	+ Pros:
		- More permissive, allowing for implicit type conversions and string concatenation.
		- May be faster due to reduced overhead from type checks.
	+ Cons:
		- Can lead to unexpected behavior if the operands are not what is expected.
		- Can introduce errors due to type conversions or other surprises.
* Strict Equals Operator (`===`):
	+ Pros:
		- More explicit and consistent way of comparing values.
		- Less likely to introduce errors due to type conversions or other surprises.
	+ Cons:
		- May be slower due to increased overhead from strict type checks.

**Library Used:**
None, as this benchmark is a vanilla JavaScript test case.

**Special JS Features/Syntax:**
No special features or syntax are used in the test cases. The code uses standard JavaScript constructs such as `while` loops, array indexing (`[]`), and assignment operators (`=`).

**Alternative Approaches:**

* Other alternatives for comparing values include:
	+ Using the `===` operator with explicit type casts (e.g., `n === 100000`)
	+ Using a custom comparison function (e.g., `function compare(a, b) { return a === b; }`)
	+ Using a library like Lodash's `isEqual()` function
* However, these alternatives are not included in the benchmark as they deviate from the original question of comparing `==` and `===` operators.

In summary, this benchmark tests the performance difference between using loose equals (`==`) versus strict equals (`===`) operators in JavaScript. The results indicate that `===` is slightly faster than `==`, but both approaches have their trade-offs in terms of explicitness, safety, and potential performance benefits.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36 Edg/100.0.1185.44

Browser/OS: Chrome 100 on Windows

View result in a separate tab

Test name	Executions per second
test equality	0.2 Ops/sec
test strict equality	1255.4 Ops/sec

Related benchmarks:

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

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

Comparing performance of: test equality vs test strict equality

Created: 7 years ago by: Guest

Jump to the latest result

test equality

test strict equality

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):