Benchmark: Symbol vs String property square bracket aa

Script Preparation code:

var foo = {};
var sym = Symbol("keykeykeykeykeykeykeykeykeykeykeykeykeykeykeykeykeykeykasfdvna;ergjnegrgoergjfefidfnvnsdfjweifjfqojfoqfojjjdfjqoooqfjjfqjfqojvvnxcvnogogq3ghergfjadfjjfjjjzjjzjjjjjjjj fjfjjqfjaf dfj ffjfqwiefjiefjiejfqej fjadoifjiwefow asdfqfqf");
var str = "keykeykeykeykeykeykeykeykeykeykeykeykeykeykeykeykeykeykasfdvna;ergjnegrgoergjfefidfnvnsdfjweifjfqojfoqfojjjdfjqoooqfjjfqjfqojvvnxcvnogogq3ghergfjadfjjfjjjzjjzjjjjjjjj fjfjjqfjaf dfj ffjfqwiefjiefjiejfqej fjadoifjiwefow asdfqfqf";

Tests:

Symbol
foo[sym] = 1;
String
foo[str] = 1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Symbol
String

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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I'll break down the provided benchmark definition and explain what's being tested.

**Benchmark Definition**

The benchmark measures the performance difference between using a `Symbol` property versus a `String` property for accessing an object's properties. The benchmark is designed to test how fast each approach can set a value on an object.

**Options Compared**

Two options are being compared:

1. **Using a `Symbol` property**: In this case, a `Symbol` named "keykeykeykeykey..." is used as the key for accessing and setting a value on an object.
2. **Using a `String` property**: A specific string literal `"keykey..."` is used as the key.

**Pros and Cons**

* **Symbol Property:**
	+ Pros:
		- Symbols are unique and can be reused across objects, reducing duplication.
		- They have better memory management properties than strings, which reduces memory usage.
	+ Cons:
		- Symbols are not printable or enumerable by default, making it harder to debug or inspect their values.
		- Some older browsers may not support symbols.
* **String Property:**
	+ Pros:
		- Strings are easily readable and editable, making it simpler for developers to work with them.
		- Most modern browsers support strings as object keys.
	+ Cons:
		- String duplication can lead to slower performance due to duplicate key lookups.

**Library Usage**

There is no specific library used in this benchmark. The benchmark relies solely on JavaScript's built-in `Symbol` and `String` types.

**Special JS Feature or Syntax**

None are mentioned, but it's worth noting that the use of symbols as property keys is a relatively modern feature introduced in ECMAScript 2015 (ES6).

**Alternative Approaches**

Other approaches to access an object's properties include:

* **Number Property**: Using a numeric value as the key.
* **Object Property**: Accessing a nested object property using bracket notation.
* **Array Property**: Using an array index as the key.

These alternatives may have different performance characteristics depending on the specific use case and requirements.

Related benchmarks:

Symbol vs String property square bracket aa (version: 0)

Comparing performance of: Symbol vs String

Created: 2 years ago by: Guest

Jump to the latest result

Symbol

String

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):