Benchmark: if(number) vs if(number == 1) vs if(number != 0) vs if(number === 0) vs if(number !== 0)

Script Preparation code:

const ns = window.ns = []
for (let i = 1000; i; --i) ns.push(i % 2)

Tests:

if(number)
for (const x of ns) { if (x) { console.log('odd') } else { console.log('even') } }
if(number == 1)
for (const x of ns) { if (x == 1) { console.log('odd') } else { console.log('even') } }
if(number != 0)
for (const x of ns) { if (x != 0) { console.log('odd') } else { console.log('even') } }
if(number === 1)
for (const x of ns) { if (x === 1) { console.log('odd') } else { console.log('even') } }
if(number !== 0)
for (const x of ns) { if (x !== 0) { console.log('odd') } else { console.log('even') } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if(number)
if(number == 1)
if(number != 0)
if(number === 1)
if(number !== 0)

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark measures the performance difference between different conditional statements in JavaScript: `if (number)`, `if (number == 1)`, `if (number != 0)`, `if (number === 0)`, and `if (number !== 0)`.

**Script Preparation Code**

The script preparation code generates an array of 1000 random numbers, where each number is either even or odd. This array is then used as the input for the benchmark tests.

**Benchmark Tests**

There are four individual test cases:

1. **if (number)**: Compares `x` to `true` in the condition.
2. **if (number == 1)**: Compares `x` to the number 1 using a strict equality operator (`===`).
3. **if (number != 0)**: Compares `x` to 0 using a non-equal operator (`!=`).
4. **if (number === 0)**: Compares `x` to 0 using a loose equality operator (`==`). Note that this is not recommended in production code.
5. **if (number !== 0)**: Compares `x` to 0 using a non-equal operator (`!==`).

**Options Compared**

The benchmark compares the performance of each test case, which can be summarized as follows:

* **Equality operators**: Comparing `x` to `true`, `1`, and `0` using different operators (`===`, `==`, and `!=`). Note that `==` is not recommended in production code.
* **Loose equality vs. strict equality**: Comparing `x` to `0` using a loose equality operator (`==`) versus a strict equality operator (`===`).

**Pros and Cons of Each Approach**

1. **Equality operators**: Using `==` can lead to unexpected results due to type coercion, whereas `===` ensures that the values are compared strictly.
2. **Loose equality vs. strict equality**: Loose equality (`==`) can lead to false positives if the values being compared are equal but not of the same data type, while strict equality (`===`) ensures accurate comparisons.

**Alternative Approaches**

Other alternatives could be explored to improve performance or handling edge cases:

* Using a more efficient conditional statement, such as a single `switch` statement or a lookup table.
* Optimizing for specific use cases, like detecting NaN values or handling Infinity.
* Considering alternative equality operators, like `===` for strict comparison and `==` for loose comparison with additional checks.

**Library Usage**

There is no library explicitly mentioned in the provided code. However, the benchmark uses standard JavaScript features like arrays, loops, conditional statements, and console logging.

**Special JS Features or Syntax**

None of the test cases use special JavaScript features or syntax beyond the standard conditions discussed above.

Overall, this benchmark helps evaluate the performance differences between various conditional statement approaches in JavaScript, providing insights for developers to optimize their code.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Browser/OS: Chrome 106 on Linux

View result in a separate tab

Test name	Executions per second
if(number)	376.5 Ops/sec
if(number == 1)	379.9 Ops/sec
if(number != 0)	369.6 Ops/sec
if(number === 1)	363.8 Ops/sec
if(number !== 0)	369.8 Ops/sec

Related benchmarks:

if(number) vs if(number == 1) vs if(number != 0) vs if(number === 0) vs if(number !== 0) (version: 0)

Comparing performance of: if(number) vs if(number == 1) vs if(number != 0) vs if(number === 1) vs if(number !== 0)

Created: 4 years ago by: Registered User

Jump to the latest result

if(number)

if(number == 1)

if(number != 0)

if(number === 1)

if(number !== 0)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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