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Splice vs Spread to insert at beginning of array
(version: 0)
Comparing performance of:
Splice vs Spread
Created:
6 years ago
by:
Guest
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Script Preparation code:
var array = Array.from({ length: 100 }).map((val, i) => i);
Tests:
Splice
var newArray = array.slice(0, 0, 99);
Spread
var newArray = [99, ...array];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Splice
Spread
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 and its options. **Benchmark Overview** The test case measures the performance of two approaches to insert an element at the beginning of an array: `splice` (Splice) and spread operator (`...`) with array destructuring. The arrays are created using `Array.from()` and have a length of 100 elements. **Options Compared** There are two options being compared: 1. **Splice**: This method modifies the original array by removing and then re-inserting the element at the specified position. 2. **Spread Operator (with Array Destructuring)**: This method creates a new array with the spread operator (`...`) and then uses array destructuring to include the desired element at the beginning. **Pros and Cons of Each Approach** ### Splice Pros: * Efficient for small arrays * Native JavaScript method, well-supported by most browsers Cons: * Modifies the original array, which may not be desirable in some cases * Can be slower than other methods for large arrays due to the need to re-insert elements ### Spread Operator (with Array Destructuring) Pros: * Creates a new array without modifying the original, preserving its integrity * Can be faster than `splice` for large arrays since it avoids the overhead of re-inserting elements Cons: * Requires support for the spread operator and array destructuring in the target browser * May be slower for very small arrays due to the creation of a new array object **Library/Functionality Used** None, as both options are built-in JavaScript methods. **Special JS Feature/Syntax** The `...` spread operator is a relatively recent addition to JavaScript (introduced in ECMAScript 2015). It allows for creating a new array by spreading elements from an existing array or object. Array destructuring is also a feature introduced in ECMAScript 2010, which enables extracting values from arrays into separate variables. **Other Alternatives** For large arrays or when performance is critical, other methods like `concat()` or libraries like Lodash's `insertAt` function might be considered as alternatives. However, these approaches may have different trade-offs and use cases compared to the spread operator and `splice`. In summary, the benchmark compares two efficient ways to insert an element at the beginning of an array in JavaScript: `splice` and spread operator with array destructuring. The choice between them depends on the specific requirements, such as preserving the original array or considering performance for large arrays.
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