Benchmark: [JS] nested if - MeasureThat.net

Script Preparation code:

var test = 0.4;
var lTimeQuantInSeconds_num = 1;

Tests:

if nested
if (test < lTimeQuantInSeconds_num) { if (test < lTimeQuantInSeconds_num * 0.5) { test = 0; } }
if one
if (test < lTimeQuantInSeconds_num && test < lTimeQuantInSeconds_num * 0.5) { test = 0; }
if single
if (test < lTimeQuantInSeconds_num * 0.5) { test = 0; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if nested
if one
if single

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Windows

View result in a separate tab

Test name	Executions per second
if nested	9270483.0 Ops/sec
if one	9370201.0 Ops/sec
if single	9251787.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one month ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON is designed to evaluate the performance of different conditional structures in JavaScript, specifically using nested if statements versus more streamlined versions. The goal is to determine how these variations in control flow impact execution speed.

### Options Compared

1. **Nested If Statements** (`if nested`):
   ```javascript
   if (test < lTimeQuantInSeconds_num)
   {
       if (test < lTimeQuantInSeconds_num * 0.5)
       {
           test = 0;
       }
   }
   ```
   This structure introduces a hierarchy of conditions. The outer condition must be true for the inner condition to be evaluated, which potentially adds to the logical overhead.

2. **Combined If Statements** (`if one`):
   ```javascript
   if (test < lTimeQuantInSeconds_num && test < lTimeQuantInSeconds_num * 0.5)
   {
       test = 0;
   }
   ```
   This syntax combines both conditions into a single if statement using the logical AND (`&&`). It checks both conditions concurrently, which can be more efficient by avoiding additional checks if the first condition fails.

3. **Single If Statement** (`if single`):
   ```javascript
   if (test < lTimeQuantInSeconds_num * 0.5)
   {
       test = 0;
   }
   ```
   In this test case, only one condition is evaluated, thus minimizing logical operations altogether. This is expected to have the least computational overhead compared to the other structures.

### Pros and Cons of Each Approach

- **Nested If Statements (If Nested)**:
  - **Pros**: Can provide clearer logic when there is a hierarchy to conditions.
  - **Cons**: More operations to evaluate, as one check depends on the other, which can lead to slower performance.

- **Combined If Statements (If One)**:
  - **Pros**: More concise and can be faster because both conditions are checked simultaneously, potentially short-circuiting the evaluation.
  - **Cons**: Can be less readable for complex conditions.

- **Single If Statement (If Single)**:
  - **Pros**: Fastest performance due to the simplicity of evaluation.
  - **Cons**: Might lack descriptive clarity on complex conditions, but this is less of a concern in simple cases like this.

### Considerations

- **Execution Context**: Each test runs in a similar environment (the same browser and platform) to ensure comparability. Browser differences, such as optimization techniques, can influence the results, so testing across multiple contexts might provide more insights.

- **Logical Complexity**: While in this example, performance differences are expected to be minimal, in larger, more complex scenarios, even minor differences in branching can lead to noticeable performance variations.

### Performance Results Summary

The results show the number of executions per second for each benchmark:

- `if one`: 9,370,201 executions per second
- `if nested`: 9,270,483 executions per second
- `if single`: 9,251,787 executions per second

From the results, we can infer that the combined if statement provides the best performance, followed closely by the nested if statement. The single if statement, while the simplest, also demonstrates the lowest performance, suggesting that simpler checks are advantageous but that combining conditions can also yield significant improvements.

### Other Alternatives

In addition to the approaches tested, developers can consider:

- **Switch Statements**: For multiple conditions, using a switch statement can sometimes yield more readable and efficient code.
- **Ternary Operators**: For very simple conditions, a ternary operator can provide a single-line conditional assignment, which is often more succinct.
- **Early Exits**: Refactoring logic to reduce nested conditions or encapsulating complex checks in functions can lead to cleaner, more maintainable code without sacrificing performance.

In summary, this benchmark effectively compares how different conditional constructs can affect performance, providing insight into best practices for structuring control flow in JavaScript.

Related benchmarks:

[JS] nested if (version: 2)

Comparing performance of: if nested vs if one vs if single

Created: one month ago by: Registered User

Jump to the latest result

if nested

if one

if single

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one month ago):