Benchmark: Assign vs Destructure

Tests:

Assign
class Foo { constructor(test) { this.prop = test.prop; } bar() { console.log(this.prop); } } const foo = new Foo({prop: '123'}); foo.bar();
Destructure
class Foo { constructor(test) { this.prop = test.prop; } bar() { const { prop } = this; console.log(prop); } } const foo = new Foo({prop: '123'}); foo.bar();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Assign
Destructure

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.

**What is being tested?**

The provided benchmark measures the performance difference between two approaches: assigning values to object properties using the assignment operator (`=`) versus destructuring those same values using object literals with shorthand syntax (`{ prop }`).

In other words, the test compares how quickly a JavaScript program can execute code that:

1. Creates an object `foo` and assigns a property value to it using `foo.prop = '123'`.
2. Creates an object `foo` and uses destructuring syntax to extract the same property value from the object's literal representation.

**Options being compared**

Two options are being compared:

1. **Assignment** (`foo.prop = '123';`)
2. **Destructuring** (`const { prop } = this; console.log(prop);`)

**Pros and Cons of each approach:**

**Assignment (using `=`)**

Pros:

* Widely supported by most JavaScript engines
* Easy to read and write, especially for developers familiar with imperative programming styles
* Does not require explicit property names or object literals

Cons:

* May lead to slower performance due to the overhead of dynamic property assignments

**Destructuring (using object literals with shorthand syntax)**

Pros:

* Can be faster than assignment when dealing with large datasets or objects, as it avoids the overhead of dynamic property assignments
* Can improve code readability and conciseness for developers familiar with destructuring syntax

Cons:

* Less widely supported by older JavaScript engines or in environments where ES6+ syntax is not enabled
* May require explicit property names or object literals when working with legacy codebases

**Library used**

None are explicitly mentioned, but the `console` object and basic string manipulation functions (e.g., `console.log()`) are likely part of the browser's built-in environment.

**Special JS feature or syntax**

The benchmark utilizes ES6+ features, specifically:

* **Class syntax**: Defined using the `class` keyword.
* **Arrow function expressions**: Not explicitly used in this benchmark, but related to the overall JavaScript ecosystem.
* **Destructuring syntax**: Used for extracting property values from object literals.

**Other alternatives**

If you'd like to explore alternative approaches or modify these benchmarks, consider:

1. Using different assignment operators (e.g., `+=`, `-=`, `*=`, etc.) to compare their performance effects.
2. Experimenting with other destructuring syntax variations (e.g., using bracket notation (`{ [key] }`)) for comparison.
3. Adding more complex object assignments or property values to analyze the impact of performance differences on different types of data structures.

Keep in mind that these modifications may require adjustments to the benchmark code and potentially affect its accuracy or relevance.

Related benchmarks:

Assign vs Destructure (version: 0)

Comparing performance of: Assign vs Destructure

Created: 3 years ago by: Guest

Jump to the latest result

Assign

Destructure

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):