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Add to array
(version: 3)
Comparing performance of:
Push vs Add at length vs Add at length using var for length - for fun
Created:
9 years ago
by:
Registered User
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Script Preparation code:
var a = [];
Tests:
Push
a.push(1);
Add at length
a[a.length] = 1;
Add at length using var for length - for fun
var len = a.length; a[len]=1;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Push
Add at length
Add at length using var for length - for fun
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Benchmark Definition:** The benchmark definition is a JSON object that represents a simple JavaScript operation. In this case, it's adding an element to an array. The three different approaches for adding an element to an array are: 1. `a.push(1);` 2. `a[a.length] = 1;` 3. `var len = a.length; a[len] = 1;` These approaches are compared in the individual test cases. **Options Compared:** The three options are compared in terms of their performance, which is measured by the number of executions per second. Pros and Cons: 1. **`a.push(1);`** * Pros: Simple, intuitive, and widely supported. * Cons: May be slower due to the overhead of creating a new element and adding it to the array's length property. 2. **`a[a.length] = 1;`** * Pros: Can be faster than `push()` as it directly modifies the existing array length property, avoiding the overhead of creating a new element. * Cons: Less intuitive and may not work correctly if the array is empty or has a negative length. 3. **`var len = a.length; a[len] = 1;`** * Pros: Can be faster than `push()` by reusing the existing array length property, but requires an extra step to calculate the index. * Cons: More complex and less intuitive. **Library Used:** There is no library explicitly mentioned in the benchmark definition or test cases. However, the use of JavaScript's built-in `Array` object and its methods (`push()`, `length`) implies that the browser being tested supports the standard JavaScript API. **Special JS Feature/Syntax:** None of the provided benchmark definitions or test cases use any special JavaScript features or syntax that would require additional explanation. **Other Alternatives:** If you want to add an element to an array, some other approaches you could consider are: * Using `unshift()`: Adds an element to the beginning of the array instead of the end. * Using `splice()`: Removes and replaces elements in the array, which can be slower than `push()` or `unshift()`. * Using a library like Lodash's `compact()` function: This function can optimize performance by using a native implementation for arrays with a limited number of elements. Keep in mind that these alternatives may have different trade-offs in terms of performance, complexity, and usage scenarios.
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teststest1
array.length = 0 vs []
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