Benchmark: Compare equals operator ( == vs === )

Tests:

test strict equality
var n = 100; var i = 200; var j = '200'; var k = '100'; var res1 = n === 100; var res2 = i === 100; var res3 = +k === 100; var res4 = +j === 100;
test strict equality with const
const n = 100; const i = 200; const j = '200'; const k = '100'; const res1 = n === 100; const res2 = i === 100; const res3 = k === 100; const res4 = j === 100;
test strict equality with let
let n = 100; let i = 200; let j = '200'; let k = '100'; let res1 = n === 100; let res2 = i === 100; let res3 = k === 100; let res4 = j === 100;
test equality
var n = 100; var i = 200; var j = '200'; var k = '100'; var res1 = n == 100; var res2 = i == 100; var res3 = k == 100; var res4 = j == 100;
test equality with cosnt
const n = 100; const i = 200; const j = '200'; const k = '100'; const res1 = n == 100; const res2 = i == 100; const res3 = k == 100; const res4 = j == 100;
test equality with let
let n = 100; let i = 200; let j = '200'; let k = '100'; let res1 = n == 100; let res2 = i == 100; let res3 = k == 100; let res4 = j == 100;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test strict equality
test strict equality with const
test strict equality with let
test equality
test equality with cosnt
test equality with let

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll dive right in.

**Benchmark Overview**

The MeasureThat.net benchmark compares the performance of using loose equality operators (`==`) versus strict equality operators (`===`) in JavaScript. The test creates four scenarios: `test strict equality`, `test strict equality with const`, `test equality`, and `test equality with let`. Each scenario is repeated multiple times, once with each of the four types of variable declarations (var, const, let).

**Variable Declarations**

In JavaScript, there are two main ways to declare variables:

1. **Var**: The var keyword creates a variable that can be reassigned later.
2. **Const` and `Let`: These keywords create variables that cannot be reassigned after they are declared.

The performance difference between these declarations is negligible in most cases, but the benchmark aims to highlight any potential differences.

**Equality Operators**

There are two types of equality operators:

1. **Loose Equality Operator (`==`)**: This operator checks if the values of both variables are equal, regardless of their data type.
2. **Strict Equality Operator (`===`)**: This operator checks if both variables have the same value and data type.

The benchmark compares the performance of using these two operators to check for equality between two variables.

**Library**

There is no explicit library used in this benchmark.

**Special JavaScript Features**

This benchmark does not use any special JavaScript features, such as async/await, Promises, or closures.

**Performance Comparison**

The benchmark measures the number of executions per second (ExecutionsPerSecond) for each test case. The values vary across different browsers and devices, indicating that there may be performance differences between these factors.

Here's a brief summary of the pros and cons of using `==` versus `===`:

**Loose Equality Operator (`==`) Pros:**

* Faster execution, as it only checks for value equality.
* More lenient in terms of data type checking.

**Loose Equality Operator (`==`) Cons:**

* May lead to unexpected behavior if the variables have different data types.
* Can hide bugs that would be caught by strict equality.

**Strict Equality Operator (`===`) Pros:**

* More accurate, as it checks both value and data type equality.
* Reduces the likelihood of unexpected behavior due to data type mismatches.

**Strict Equality Operator (`===`) Cons:**

* Slower execution, as it performs an additional check for data type equality.

In general, using `===` is a good practice in JavaScript development, especially when working with numeric or boolean values. However, the performance difference between `==` and `===` is usually negligible, and other factors like variable declaration and browser/ device differences play a more significant role in determining execution speed.

**Alternatives**

Other alternatives for benchmarking JavaScript performance include:

1. **Benchmark.js**: A popular open-source benchmarking library.
2. **Benchpress.js**: Another widely used benchmarking library.
3. **jsperf.com**: An online platform for benchmarking JavaScript code.
4. **Google's Chrome DevTools**: Includes a built-in profiler and benchmarking tools.

These alternatives offer more features, flexibility, and accuracy than MeasureThat.net, but they may require more setup and configuration.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:109.0) Gecko/20100101 Firefox/115.0

Browser/OS: Firefox 115 on Mac OS X 10.13

View result in a separate tab

Test name	Executions per second
test strict equality	566246592.0 Ops/sec
test strict equality with const	571021376.0 Ops/sec
test strict equality with let	549162624.0 Ops/sec
test equality	566847872.0 Ops/sec
test equality with cosnt	565727040.0 Ops/sec
test equality with let	564533248.0 Ops/sec

Related benchmarks:

Compare equals operator ( == vs === ) (version: 0)

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

Comparing performance of: test strict equality vs test strict equality with const vs test strict equality with let vs test equality vs test equality with cosnt vs test equality with let

Created: one year ago by: Guest

Jump to the latest result

test strict equality

test strict equality with const

test strict equality with let

test equality

test equality with cosnt

test equality with let

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):