Benchmark: split vs object - MeasureThat.net

Script Preparation code:

var a = {'0_up':1,'0_down':2,'0_left':3,'0_right':4};
var b = {0:{'up':1,'down':2,'left':3,'right':4}};

Tests:

A
for ( var i in a ) { if ( i.split( '_' )[ 0 ] === '0' ) { console.log(a[i]); } }
B
for ( var i in b ) { for ( var j in b[i] ) { console.log(b[i][j]); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
A
B

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

This benchmark tests two different ways to access and log values from nested data structures in JavaScript:

**Option A:** Uses `split` on string keys and a `for...in` loop.

```javascript
for ( var i in a ) {
  if ( i.split( '_' )[ 0 ] === '0' ) {
    console.log(a[i]);
  }
}
```

* **How it works:** It iterates over the keys of object `a`. For each key, it splits the string by underscores (`_`) and checks if the first part is "0". If true, the corresponding value is logged.

**Option B:** Directly accesses nested properties using a nested loop.

```javascript
for ( var i in b ) {
  for ( var j in b[i] ) {
    console.log(b[i][j]);
  }
}
```

* **How it works:** It iterates over the outer object `b`. For each key in the outer object, it then iterates over the nested properties and logs them.

**Pros and Cons:**

* **Option A (Splitting):**
    * **Con:** More complex to read and understand due to string manipulation and conditional checks. Potential for performance issues if splitting is computationally expensive. 
    * **Pro:** Might be more concise in some cases where the key structure is very specific.

* **Option B (Direct Access):**
    * **Con:** Can be more verbose than Option A, especially with deeply nested objects.
    * **Pro:** Generally considered more readable and efficient for accessing nested properties directly. JavaScript engines are usually optimized for this kind of direct access.

**Other Considerations:**

The choice between these methods depends on the specific use case and data structure. If you have a very large number of keys with complex patterns, Option B might be preferable due to its efficiency.

**Alternatives:**

* **Object destructuring:**  Modern JavaScript allows for more concise and readable ways to access object properties using destructuring. This could potentially offer better performance than either of the options presented in the benchmark.
* **Libraries/Frameworks:** Libraries like Lodash or Underscore provide utility functions for working with objects, which may be more efficient and flexible depending on your needs.

Related benchmarks:

split vs object (version: 0)

Comparing performance of: A vs B

Created: 8 years ago by: Guest

Jump to the latest result

A

B

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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