Benchmark: set num vs set fnCall vs typecheck then set

Script Preparation code:

var obj = { a:1 }

function setNumber(key, value) {
  obj[key] = value;
}

function setCall(key, getValue) {
  obj[key] = getValue(obj);
}

function setTypecheck(key, value) {
  obj[key] = typeof value === "number" ? value : value(obj);
}

function getValue() {
  return 100;
}

Tests:

setNumber
setNumber("a", 100);
setCall
setCall("a", getValue);
setTypecheck(num)
setTypecheck("a", 100);
setTypecheck(call)
setTypecheck("a", getValue);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
setNumber
setCall
setTypecheck(num)
setTypecheck(call)

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark JSON and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition:**

The benchmark definition is a JSON object that describes the experiment:
```json
{
  "Name": "set num vs set fnCall vs typecheck then set",
  "Description": null,
  "Script Preparation Code": ...,
  "Html Preparation Code": null
}
```
This benchmark involves three different approaches to set values on an object `obj`:

1. **setNumber**: sets the value using a direct assignment (`obj[key] = value;`)
2. **setCall**: uses a function call to set the value (`obj[key] = getValue(obj);`)
3. **setTypecheck**: first checks if the value is a number using `typeof value === "number"`, and then sets the value accordingly (`obj[key] = typeof value === "number" ? value : value(obj);`)

**Individual Test Cases:**

The benchmark consists of four test cases, each with its own `Benchmark Definition` string:
```json
[
  {
    "Benchmark Definition": "setNumber(\"a\", 100);",
    "Test Name": "setNumber"
  },
  {
    "Benchmark Definition": "setCall(\"a\", getValue);",
    "Test Name": "setCall"
  },
  {
    "Benchmark Definition": "setTypecheck(\"a\", 100);",
    "Test Name": "setTypecheck(num)"
  },
  {
    "Benchmark Definition": "setTypecheck(\"a\", getValue);",
    "Test Name": "setTypecheck(call)"
  }
]
```
Each test case measures the execution time of its corresponding benchmark definition.

**Library:**

The `getValue` function is a custom library, not part of the standard JavaScript. Its purpose is to return a constant value (`return 100;`) for use in the `setCall` and `setTypecheck` functions.

**Special JS Feature/Syntax:**

There are no special features or syntax mentioned in this benchmark.

**Pros and Cons of Different Approaches:**

1. **setNumber**: direct assignment is likely to be the fastest, as it avoids function calls and type checks.
	* Pros: simple, fast
	* Cons: may not handle non-numeric values correctly
2. **setCall**: using a function call introduces overhead, but provides flexibility for handling different types of values.
	* Pros: flexible, handles non-numeric values correctly
	* Cons: slower due to function calls and type checks
3. **setTypecheck**: first checks if the value is a number before setting it. This approach balances speed and safety.
	* Pros: balances speed and safety, handles non-numeric values correctly
	* Cons: introduces additional overhead from type checks

**Other Alternatives:**

If not using `getValue`, alternative implementations for the `setCall` function could use other constant values or functions to simulate different scenarios.

For example, instead of `getValue() { return 100; }`, you could use:

```javascript
function setConstantValue(key, value) {
  obj[key] = value;
}
```

This would remove the overhead of a function call and directly assign the value.

Related benchmarks:

set num vs set fnCall vs typecheck then set (version: 0)

Comparing performance of: setNumber vs setCall vs setTypecheck(num) vs setTypecheck(call)

Created: 3 years ago by: Guest

Jump to the latest result

setNumber

setCall

setTypecheck(num)

setTypecheck(call)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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