Benchmark: if vs dict - MeasureThat.net

Tests:

if - no match
let a = 'te2st'; function test() { if(a === 'crest') { return 'no'; } else if(a === 'chest') { return 'bo'; } else if(a === 'test') { return 'yoo'; } return null; } test();
if - third match
let a = 'test'; function test() { if(a === 'crest') { return 'no'; } else if(a === 'chest') { return 'bo'; } else if(a === 'test') { return 'yoo'; } return null; } test();
if - second match
let a = 'chest'; function test() { if(a === 'crest') { return 'no'; } else if(a === 'chest') { return 'bo'; } else if(a === 'test') { return 'yoo'; } return null; } test();
if - first match
let a = 'crest'; function test() { if(a === 'crest') { return 'no'; } else if(a === 'chest') { return 'bo'; } else if(a === 'test') { return 'yoo'; } return null; } test();
dict
let a = 'crest'; function test() { let dict = { 'crest' : 'no', 'chest' : 'bo', 'test' : 'yoo' } return dict[a]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if - no match
if - third match
if - second match
if - first match
dict

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which defines two approaches to test:

1. **`dict`**: This approach uses a dictionary (object) to look up the value associated with the key `a`.
2. **If-else chain**: This approach uses an if-else statement to check for matching values of `a`.

**Options Compared**

The benchmark compares these two approaches in terms of performance, specifically:

* **`dict`**: Uses a dictionary (object) to look up the value associated with the key `a`.
* **If-else chain**: Uses an if-else statement to check for matching values of `a`.

**Pros and Cons of Each Approach**

1. **`dict`**:
	* Pros:
		+ Fast lookup times, as dictionaries are implemented using hash tables.
		+ Concise code, eliminating the need for multiple if-else branches.
	* Cons:
		+ Requires a dictionary object to be created, which may incur overhead.
2. **If-else chain**:
	* Pros:
		+ No additional memory allocation is required.
		+ Easy to understand and maintain, as each branch is a separate block of code.
	* Cons:
		+ May have slower lookup times due to the need for multiple comparisons.

**Other Considerations**

1. **Library Usage**: The `dict` approach uses the built-in JavaScript object (dictionary) to perform the lookup. This is a fundamental part of the language and is widely supported.
2. **Special JS Features/Syntax**: There are no special JavaScript features or syntax used in this benchmark.

**Other Alternatives**

If you were to implement these benchmarks using alternative approaches, some options could be:

1. **Regular expressions**: Use regular expressions to match the value of `a` and return the corresponding string.
2. **Switch statement**: Use a switch statement instead of an if-else chain to handle multiple cases.
3. **Array search**: Use array methods (e.g., `indexOf()`) to find the index of the matching value in an array.

However, these alternatives may not provide the same level of performance as the original approaches used in the benchmark.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36 Edg/103.0.1264.62

Browser/OS: Chrome 103 on Windows

View result in a separate tab

Test name	Executions per second
if - no match	55565076.0 Ops/sec
if - third match	48619336.0 Ops/sec
if - second match	23693822.0 Ops/sec
if - first match	46530320.0 Ops/sec
dict	365712672.0 Ops/sec

Related benchmarks:

if vs dict (version: 0)

Comparing performance of: if - no match vs if - third match vs if - second match vs if - first match vs dict

Created: 2 years ago by: Guest

Jump to the latest result

if - no match

if - third match

if - second match

if - first match

dict

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):