Benchmark: Delete vs destructure for objects without mutating-many

Script Preparation code:

function foo() {
    return {
        a: "asjldfhsajklhdfdakjfklsahjc",
        b: "asjldfhsajklhdfdakjfklsahjc",
        c: "asjldfhsajklhdfdakjfklsahjc",
        d: "asjldfhsajklhdfdakjfklsahjc",
        e: "asjldfhsajklhdfdakjfklsahjc",
        f: "asjldfhsajklhdfdakjfklsahjc",
        g: "asjldfhsajklhdfdakjfklsahjc",
        h: "asjldfhsajklhdfdakjfklsahjc",
        i: "asjldfhsajklhdfdakjfklsahjc",
        j: "asjldfhsajklhdfdakjfklsahjc",
        k: "asjldfhsajklhdfdakjfklsahjc",
        l: "asjldfhsajklhdfdakjfklsahjc",
        m: "asjldfhsajklhdfdakjfklsahjc",
        n: {
            a: "asjldfhsajklhdfdakjfklsahjc",
            b: "asjldfhsajklhdfdakjfklsahjc",
            c: "asjldfhsajklhdfdakjfklsahjc",
            d: "asjldfhsajklhdfdakjfklsahjc",
            e: "asjldfhsajklhdfdakjfklsahjc"
        }
    };
}

Tests:

delete
const obj = foo(); delete obj.d; delete obj.n.c
Rest object
const { d, ...rest } = foo(); delete rest.n.c

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
Rest object

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 break down the provided benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark measures the performance of two different approaches to remove properties from an object without mutating many:

1. `delete obj.d; delete obj.n.c` (Delete approach)
2. `{ d, ...rest } = foo(); delete rest.n.c` (Rest object approach)

**What is being tested?**

Both approaches test how fast each method can remove multiple properties from an object without modifying the original object.

The benchmark creates a large object `obj` with 31 properties, including nested objects (`n`). The test case measures the time it takes to delete all 31 properties using each approach.

**Options compared**

Two options are being compared:

1. **Delete approach**: This method uses the unary `delete` operator to remove individual properties from the object.
2. **Rest object approach**: This method uses destructuring assignment to extract specific properties from the object and then deletes them.

**Pros and Cons of each approach**

* **Delete approach**:
	+ Pros: Simple, easy to understand, and widely supported.
	+ Cons: Can be slower for large objects due to the overhead of repeated property lookups.
* **Rest object approach**:
	+ Pros: More efficient for large objects since it avoids repeated property lookups.
	+ Cons: Requires understanding of destructuring assignment and can be more complex.

**Library used**

None, as both approaches use built-in JavaScript features.

**Special JS feature or syntax**

No specific special features or syntax are being tested in this benchmark. However, the Rest object approach relies on a modern JavaScript feature that might not be supported in older browsers or versions of JavaScript.

**Other alternatives**

If you wanted to test alternative approaches, some options could include:

1. Using `Object.keys()` and `forEach()` to remove properties.
2. Creating a new object with deleted properties using `{ ...obj }` and then deleting the old object.
3. Using a library like Lodash or Underscore.js that provides utility functions for property removal.

Keep in mind that these alternatives might have different performance characteristics and trade-offs compared to the original delete approach.

Related benchmarks:

Delete vs destructure for objects without mutating-many (version: 0)

Measure the performance of delete versus removing a prop from an object without mutating

Comparing performance of: delete vs Rest object

Created: 3 years ago by: Guest

Jump to the latest result

delete

Rest object

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):