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Array: delete vs null vs undefined vs 0
(version: 0)
Comparing performance of:
Delete vs Null vs Undefined vs 0
Created:
3 years ago
by:
Registered User
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Script Preparation code:
var arr = []; for (let i = 0; i < 1000; i++) { arr[i] = { test: 1 }; }
Tests:
Delete
for (let i = 0; i < 1000; i++) { delete arr[i]; }
Null
for (let i = 0; i < 1000; i++) { arr[i] = null; }
Undefined
for (let i = 0; i < 1000; i++) { arr[i] = undefined; }
0
for (let i = 0; i < 1000; i++) { arr[i] = 0; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
Delete
Null
Undefined
0
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested. **Benchmark Definition** The JSON defines a benchmark test for comparing different ways to delete or assign a value to an array element in JavaScript. **Options Compared** The options being compared are: 1. `delete`: attempting to delete an element from the array using the `delete` keyword. 2. `null`: assigning `null` to an array element. 3. `undefined`: assigning `undefined` to an array element. 4. `0`: assigning the value `0` to an array element. **Pros and Cons of Each Approach** 1. **Delete**: This approach is often considered the fastest way to remove an element from an array in JavaScript, as it only updates the internal array length and doesn't create a new object or copy the element's contents. * Pros: Fast and efficient. * Cons: Can be slower than other approaches if the array is large or has many elements. 2. **Null**: Assigning `null` to an array element creates a new object reference, which can lead to performance issues if the array is large or frequently updated. * Pros: Simple and easy to implement. * Cons: Can be slower than other approaches due to object creation and garbage collection. 3. **Undefined**: Similar to assigning `null`, assigning `undefined` creates a new object reference, which can also lead to performance issues if the array is large or frequently updated. * Pros: Simple and easy to implement. * Cons: Can be slower than other approaches due to object creation and garbage collection. 4. **0**: Assigning a value of `0` to an array element creates a new object reference, which can lead to performance issues if the array is large or frequently updated. * Pros: Simple and easy to implement. * Cons: Can be slower than other approaches due to object creation and garbage collection. **Library Used** None of the provided benchmark options rely on any external libraries. **Special JS Features/Syntax** None of the provided benchmark options use any special JavaScript features or syntax, such as async/await, promises, or modern language features like `let` or `const`. **Other Alternatives** If you're interested in testing other approaches to delete or assign a value to an array element in JavaScript, you could consider: 1. Using the `splice()` method instead of `delete`. 2. Creating a new array with the desired elements using array methods like `slice()` or `map()`. 3. Using a third-party library like Lodash to implement array operations. Keep in mind that these alternatives may introduce additional complexity and potential performance differences compared to the original benchmark options.
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Comments
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