Benchmark: Nullish coalescing V.S. if/else (native)

Tests:

If/Else
let a = null; let b = 1; const check = (a, b) => { if (a != null) { return a; } else { return b; } } for (let i = 1; i < 1e6; i++){ check(a,b); }
Nullish
let a = null; let b = 1; const check = (a, b) => { return a ?? b; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
If/Else
Nullish

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
If/Else	3088.3 Ops/sec
Nullish	181430368.0 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark compares the performance of two ways to handle potential null values in JavaScript:

**1. Traditional `if/else` statement:**

-  Code checks if `a` is not null. If it's not null, it returns `a`. Otherwise, it returns `b`.

**2. Nullish coalescing operator (`??`)**:

- This approach directly returns `a` if it's not null or undefined; otherwise, it uses `b` as the fallback value.

**Pros and Cons:**

* **Nullish Coalescing:**
    - **Pros:**  More concise and readable code. 
    - **Cons:** Can be slightly less performant in some cases due to its dynamic nature.

* **`if/else` Statement:**
    - **Pros:** Potentially more performant in certain scenarios where the compiler can optimize it better. More familiar to developers who've been using JavaScript for a long time.
    - **Cons:** Can be verbose and less readable, especially when handling multiple null checks.

**Other Considerations:**

* **Real-world scenarios:**  In most practical applications, the performance difference between these two methods is negligible. The choice often comes down to code readability and style preferences.

* **Alternative libraries:** There aren't any specific libraries used in this benchmark. The focus is on comparing built-in JavaScript features.

Let me know if you have any more questions about the benchmark or want to explore other JavaScript performance comparisons!

Related benchmarks:

Nullish coalescing V.S. if/else (native) (version: 0)

Comparing performance of: If/Else vs Nullish

Created: 3 years ago by: Guest

Jump to the latest result

If/Else

Nullish

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):