Benchmark: Array iteration: delete vs splice

Script Preparation code:

var alphabets = [...'abcdefghijklmnopqrstuvwxyz'];
var arr = alphabets.map(cur => ({ id: cur, value: cur }));
var arrA = [...arr, ...arr, ...arr, ...arr, ...arr];
var arrB = arr.reverse();

Tests:

delete
arrA.forEach(cur => { arrB.every((val, idx) => { if (cur.id === val.id) { delete arrB[idx]; return false; } return true; }); });
splice
arrA.forEach(cur => { arrB.every((val, idx) => { if (cur.id === val.id) { arrB = arrB.splice(idx, 1); return false; } return true; }); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
splice

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.

Let's dive into the provided benchmark and explain what's being tested, compared, and considered.

**Benchmark Overview**

The benchmark compares two approaches for removing elements from an array: `delete` and `splice`. The test case consists of two parts:

1. **Array Preparation**: An array `arr` is created using the `map()` method, and a new array `arrA` is created by duplicating `arr` five times.
2. **Benchmark Test**: Two test cases are executed:
	* `delete`: The `forEach()` method is used to iterate over `arrB`, which is an empty array. For each element in `arrA`, the code checks if the corresponding element in `arrB` exists using `every()`. If a match is found, the element at that index is deleted from `arrB`.
	* `splice`: The same logic as above, but instead of deleting the element, it uses the `splice()` method to remove the first occurrence of the matching element.

**Options Compared**

The two options being compared are:

1. **`delete`**: Deletes the element from the array.
2. **`splice()`**: Removes the first occurrence of the element from the array.

**Pros and Cons**

* **`delete`**:
	+ Pros: Faster execution, as it directly removes the element without creating a new array.
	+ Cons: Can lead to unnecessary memory allocations if not used carefully (e.g., when deleting multiple elements).
* **`splice()`**:
	+ Pros: More predictable and controlled removal of elements, especially when dealing with large arrays or complex data structures.
	+ Cons: Slower execution due to the creation of a new array slice.

**Library Used**

There is no explicit library used in this benchmark. However, it's worth noting that `map()` and `forEach()` are built-in methods in JavaScript.

**Special JS Feature/Syntax**

None mentioned in the provided code snippets. However, it's essential to be aware of other JavaScript features like:

* **Arrow functions**: Used in both test cases (`cur => { ... }`).
* **Template literals**: Used for string concatenation and interpolation (`"\r\nvar alphabets = [...'abcdefghijklmnopqrstuvwxyz'];"`).

**Other Alternatives**

If you want to explore alternative approaches, consider the following:

* Using `filter()` instead of `forEach()` or `splice()`.
* Utilizing `Array.prototype.reduce()` for more complex removal operations.
* Leveraging libraries like Lodash (with `filterBy`) or Ramda (with `removeAt`) for functional programming-inspired solutions.

Keep in mind that each alternative approach may have its own trade-offs and performance implications.

Related benchmarks:

Array iteration: delete vs splice (version: 0)

Comparing performance of: delete vs splice

Created: 5 years ago by: Registered User

Jump to the latest result

delete

splice

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):