Benchmark: If vs Switch - MeasureThat.net

Script Preparation code:

let value = 'Cancelled';

Tests:

ifTest1
function ifTest1() { if(value === 'Rejected' || value === 'Cancelled'){ return true; } }
ifTest2
function ifTest2() { if(value === 'Blue' || value === 'Red') { return false; } if(value === 'Rejected' || value === 'Cancelled'){ return true; } }
ifTest3
function ifTest3() { if(value === 'Rejected' || value === 'Cancelled'){ return true; } if(value === 'Blue' || value === 'Red') { return false; } }
switchTest1
function switchTest1() { switch(value) { case 'Rejected': return true; case 'Cancelled': return true; } }
switchTest2
function switchTest2() { switch(value) { case 'Rejected': return true; case 'Cancelled': return true; default: return false; } }
switchTest3
function switchTest3() { switch(value) { case 'Rejected': return true; case 'Blue': return false; case 'Red': return false; case 'Cancelled': return true; default: return false; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ifTest1
ifTest2
ifTest3
switchTest1
switchTest2
switchTest3

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 days ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.2

View result in a separate tab

Test name	Executions per second
ifTest1	559462272.0 Ops/sec
ifTest2	483612576.0 Ops/sec
ifTest3	473697536.0 Ops/sec
switchTest1	498405440.0 Ops/sec
switchTest2	481602496.0 Ops/sec
switchTest3	533799456.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided JSON represents a benchmark suite that compares the performance of `if` statements and `switch` statements in JavaScript. The benchmark consists of six test cases, each with its own script preparation code and HTML preparation code (which is empty in this case).

**Script Preparation Code**

The script preparation code defines the variable `value` as `'Cancelled'`. This value will be used to determine the outcome of the `if` or `switch` statements.

**Test Cases**

There are three types of test cases:

1. **If Test Cases**: These test cases use a single `if` statement with an `||` operator to check if the `value` is either `'Rejected'` or `'Cancelled'`. The test cases vary in their order and nesting:
	* `ifTest1`: The condition is checked first, followed by the return statement.
	* `ifTest2`: The conditions are checked in a different order, with the second condition being evaluated after the first one.
	* `ifTest3`: The conditions are also checked in a different order, but this time, the second condition is evaluated before the first one.
2. **Switch Test Cases**: These test cases use a `switch` statement to check if the `value` matches one of several specified values:
	* `switchTest1`: Only two values (`'Rejected'` and `'Cancelled'`) are matched.
	* `switchTest2`: Three values (`'Rejected'`, `'Cancelled'`, and an unknown value) are matched, with a default return statement.
	* `switchTest3`: Four values (`'Blue'`, `'Red'`, `'Rejected'`, and `'Cancelled'`) are matched, with different return statements for each value.

**Comparison**

The benchmark compares the performance of these three approaches:

1. **If Statements**: The `if` statements are evaluated in the order specified by the test case.
2. **Switch Statements**: The `switch` statements use a table-driven approach to evaluate the conditions and return the corresponding value.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **If Statements**
	* Pros: Simple, easy to understand, and maintain.
	* Cons: Can lead to slower performance due to the sequential evaluation of conditions.
2. **Switch Statements**
	* Pros: Can be faster than `if` statements, especially for large numbers of cases.
	* Cons: Can be more complex to understand and maintain, especially for large switch blocks.

**Library and Special JavaScript Features**

There is no library explicitly mentioned in the benchmark code. However, the use of `||` operator in the `if` test cases implies the use of a JavaScript operator that supports logical OR.

No special JavaScript features are used in this benchmark.

**Alternatives**

If you're interested in exploring alternative approaches to this benchmark, here are some options:

1. **Regular Expressions**: You can use regular expressions to implement the `switch` statements and compare their performance.
2. **Object-based approach**: Instead of using a switch statement, you can create an object with values as keys and return statements as values, and then evaluate the object to determine the return value.
3. **Parser-based approach**: You can write a parser to analyze the code and determine the control flow graph (CFG), which would allow for a more accurate comparison of the performance of different approaches.

These alternatives might provide additional insights into the performance characteristics of JavaScript control structures, but they may also introduce complexity and overhead that's not present in the original benchmark.

Related benchmarks:

If vs Switch (version: 0)

Comparing performance of: ifTest1 vs ifTest2 vs ifTest3 vs switchTest1 vs switchTest2 vs switchTest3

Created: 6 years ago by: Guest

Jump to the latest result

ifTest1

ifTest2

ifTest3

switchTest1

switchTest2

switchTest3

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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