Benchmark: Var vs obj - MeasureThat.net

Script Preparation code:

var a,b;

var ob = {};

Tests:

var
a = "a"; b="b";
obj
ob.a = "a"; ob.b = "b";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
var
obj

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the explanation of the provided JSON benchmark data.

**What is being tested?**

The benchmark tests two approaches to assign values to variables: using the `var` keyword and using an object (`obj`). In the test cases, each approach has a simple assignment statement: "a = 'a'" (or "b = 'b'", but we'll focus on one example).

**Options compared**

The benchmark compares the performance of two approaches:

1. **Var**: Using the `var` keyword to declare and assign values to variables.
2. **Obj**: Assigning values to an object's properties using dot notation (`ob.a = 'a'`, `ob.b = 'b'`).

**Pros and Cons of each approach**

* **Var**:
	+ Pros: Simple, widely supported, and easy to read.
	+ Cons: Can lead to variable hoisting issues (variable declarations can be moved to the top of the scope), makes debugging harder due to variable naming conflicts.
* **Obj**:
	+ Pros: Avoids variable hoisting issues, provides a clear distinction between variable names, and is often used in object-oriented programming.
	+ Cons: Requires creating an object instance first (if not already present) and using dot notation for assignment.

**Library usage**

The benchmark uses the JavaScript `var` keyword to declare variables, which is part of the ECMAScript specification. No libraries are explicitly mentioned as being used in this benchmark.

**Special JS feature or syntax**

There doesn't seem to be any specific special JS feature or syntax being tested in this benchmark.

**Other alternatives**

In modern JavaScript development, alternative approaches like `let` and `const` for variable declarations could also be tested. These keywords are designed to improve code clarity, safety, and performance compared to the traditional `var` keyword.

For object assignment, one might consider using the `new` operator or a function expression with an object literal, but these would likely introduce additional complexity that isn't relevant to this simple benchmark.

Keep in mind that the choices of variable declaration keywords (e.g., `var`, `let`, `const`) and object assignment syntax can significantly impact performance in modern JavaScript engines.

Related benchmarks:

Var vs obj (version: 0)

.

Comparing performance of: var vs obj

Created: 8 years ago by: Guest

Jump to the latest result

var

obj

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):