Benchmark: Spread vs IF - MeasureThat.net

Tests:

Spread
const child1 = { a: 1 } const child2 = { a: 3 } const parent = { ...(Math.random() > .5 ? child1 : child2), b: 2 }
IF
const parent = { b: 2 } if (Math.random() > .5) { parent.a = 1 } else { parent.a = 3 }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
IF

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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Let's break down the benchmark and explain what's being tested, compared, and other considerations.

**What is being tested?**

The two individual test cases are comparing the performance of using the spread operator (`...`) versus conditional statements (IF) to merge objects in JavaScript. The benchmark is checking which approach is faster for a given scenario.

**Options compared:**

1. **Spread Operator (`...`)**: This syntax is used to create a new object by copying properties from an existing object.
2. **Conditional Statements (IF)**: This approach involves using an if-else statement to check conditions and assign values to variables accordingly.

**Pros and Cons of each approach:**

**Spread Operator (`...`):**

Pros:

* More concise and expressive syntax
* Easier to read and understand, especially for smaller objects
* Less prone to typos or errors

Cons:

* Can be slower due to the creation of a new object
* May incur additional memory overhead if the original object is large

**Conditional Statements (IF):**

Pros:

* Often faster and more efficient than using spread operator
* Can avoid creating unnecessary intermediate objects

Cons:

* More verbose syntax can lead to errors or confusion
* Requires careful consideration of branch prediction and conditionals in JavaScript engines

**Other considerations:**

1. **Library usage**: The benchmark does not use any external libraries, but it's worth noting that libraries like Lodash or Ramda might provide more efficient alternatives for object merging.
2. **Special JS features/syntax**: There are no special JS features or syntax used in this benchmark.

**Benchmark preparation code:**

The script preparation code is empty, which means the benchmark starts with a clean slate and only executes the provided JavaScript code.

**Individual test cases:**

Each test case consists of a single benchmark definition and a test name. The first test case uses the spread operator to merge two objects (`child1` and `child2`) into a parent object. The second test case uses an if-else statement to conditionally assign values to the `a` property in the parent object.

**Latest benchmark result:**

The latest benchmark results show that the IF approach is significantly faster than the spread operator approach for this particular scenario, with Chrome 86 outperforming the spread operator by a factor of approximately 4.2x (655,7890.5 vs 155,1456.0 executions per second).

Related benchmarks:

Spread vs IF (version: 0)

Comparing performance of: Spread vs IF

Created: 5 years ago by: Guest

Jump to the latest result

Spread

IF

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):