Benchmark: Spread operator vs apply vs apply undefined

Script Preparation code:

function test() { console.log(arguments[arguments.length - 1]); }
var using = (new Array(200)).fill(null).map((e, i) => (i));

Tests:

spread
test(...using);
apply
test.apply(null, using)
apply undefined
test.apply(undefined, using)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
apply
apply undefined

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is designed to compare three ways of calling a function dynamically with arbitrary arguments:

1. **Spread operator (`...`)**: This method uses the spread operator to pass an array of arguments to the function.
2. **`apply()`**: This method uses the `apply()` method, which takes two arguments: the target object and an array of arguments.
3. **`apply(undefined)`**: This method is similar to the previous one but passes `undefined` as the first argument instead.

**Pros and Cons**

*   **Spread operator (`...`)**:
    *   Pros: concise and easy to read, works well with modern JavaScript versions.
    *   Cons: may not be supported in older browsers or Node.js versions.
*   **`apply()`**: Pros: widely supported across browsers and Node.js versions. Cons: can look less readable than the spread operator approach.
*   **`apply(undefined)`**:
    *   Pros: similar to `apply()`, but may be a good fallback when the target object is not set or is null/undefined.
    *   Cons: may lead to unexpected behavior if not used carefully.

**Library Usage**

None of the provided test cases use any external libraries. However, it's worth noting that the benchmark script uses a `map()` function to create an array with 200 elements filled with `null`, which is a built-in JavaScript method.

**Special JS Feature/Syntax**

There are no specific JavaScript features or syntax used in this benchmark, such as async/await, destructuring, or ES6 classes.

**Alternative Approaches**

If you wanted to use alternative approaches, here are a few options:

*   **Closures**: You could create a closure function that takes an array of arguments and calls itself with the spread operator.
*   **Function expressions**: Instead of using `apply()`, you could define a separate function expression that accepts multiple arguments.

**Benchmark Preparation Code**

The provided script preparation code is:
```javascript
function test() { console.log(arguments[arguments.length - 1]); }

var using = (new Array(200)).fill(null).map((e, i) => (i));
```
This creates an array `using` with 200 elements filled with null and maps over it to create a new array with the indices as arguments.

Related benchmarks:

Spread operator vs apply vs apply undefined (version: 0)

Compare the differing ways you can call a function with arbitrary arguments dynamically

Comparing performance of: spread vs apply vs apply undefined

Created: 5 years ago by: Guest

Jump to the latest result

spread

apply

apply undefined

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):