Benchmark: object literal vs comparisons

Script Preparation code:

var a = true, b = true, c = false;
var prevA = true, prevB = false, prevC = true;

Tests:

object literal
var o = { a: a, b: b, c: c };
comparison with prev values
prevA !== a || prevB !== b || prevC !== c

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object literal
comparison with prev values

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

**Benchmark Definition**

The benchmark is testing two approaches to create objects in JavaScript: object literals and comparisons.

**Object Literal Approach**

In this approach, an object `o` is created using an object literal syntax:
```javascript
var o = { a: a, b: b, c: c };
```
Here, `a`, `b`, and `c` are variables that have been previously defined. The object literal creates a new object with the specified properties.

**Comparison Approach**

In this approach, a comparison is performed to create an object:
```javascript
prevA !== a || prevB !== b || prevC !== c
```
Here, `prevA`, `prevB`, and `prevC` are variables that have been previously defined. The expression evaluates to true if at least one of the properties has changed.

**Pros and Cons**

Object Literal Approach:

Pros:

* More concise and expressive syntax
* Easier to read and understand
* Typically faster execution

Cons:

* Can lead to errors if variables are not in scope or have incorrect types
* May not work as expected with certain data structures (e.g., arrays)

Comparison Approach:

Pros:

* Avoids errors caused by variable scoping issues
* Works correctly with arrays and other data structures

Cons:

* Less concise and expressive syntax
* Can be slower execution due to the overhead of comparisons

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* Readability and maintainability: Object literals are often preferred for their clarity and conciseness.
* Performance: If speed is critical, object literals might be a better choice. However, the difference in performance may not be significant in most cases.

**Library and Special JS Features**

There are no libraries or special JavaScript features used in this benchmark.

**Test Case Analysis**

The test case consists of two individual tests:

1. "object literal" - This test creates an object using an object literal syntax.
2. "comparison with prev values" - This test performs a comparison to create an object, using the previous values as a reference.

Both tests aim to measure the performance difference between these two approaches.

**Alternatives**

Other alternatives for creating objects in JavaScript include:

* Using constructors (e.g., `new Object()`)
* Using functions (e.g., `Object.create()` or `function () { ... }`)
* Using other data structures, such as arrays with object properties

However, the object literal approach is generally the most common and efficient way to create objects in JavaScript.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser/OS: Chrome 93 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
object literal	5257280.5 Ops/sec
comparison with prev values	3766295.5 Ops/sec

Related benchmarks:

object literal vs comparisons (version: 0)

Comparing performance of: object literal vs comparison with prev values

Created: 3 years ago by: Guest

Jump to the latest result

object literal

comparison with prev values

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):