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Array.prototype.slice vs spread operator 123
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
6 years ago
by:
Guest
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Tests:
Array.prototype.slice
let params = new Array(100); let result = params.slice(1); let first = params[0];
spread operator
let params = new Array(100); let [ first, ...result ] = params;
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Suite status:
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Result
Array.prototype.slice
spread operator
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The provided benchmark is designed to compare two approaches for creating an array slice or spread: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`...`). **Options Compared** Two options are being compared: 1. **Traditional `Array.prototype.slice()` method**: This approach takes an array as input and returns a new array containing a subset of elements. 2. **New ES6 spread operator (`...`)**: This approach uses the spread operator to create a new array from an existing one, allowing for more concise syntax. **Pros and Cons** * **Traditional `Array.prototype.slice()` method**: * Pros: * Well-established and widely supported. * Provides fine-grained control over slice operations (e.g., specifying start and end indices). * Cons: * More verbose syntax compared to the spread operator. * May incur additional overhead due to method call. * **New ES6 spread operator (`...`)**: * Pros: * Concise and readable syntax. * Reduces boilerplate code, making it easier to create arrays from other data structures (e.g., tuples, sets). * Cons: * May not be as well-supported by older browsers or environments. * Can lead to confusion if not used carefully. **Library and Purpose** The benchmark does not use any specific JavaScript libraries. However, it's worth noting that the `...` spread operator was introduced in ECMAScript 2015 (ES6) as a way to simplify array creation and manipulation. **Special JS Feature or Syntax** The benchmark leverages the new ES6 spread operator (`...`). This feature allows for more concise syntax when working with arrays, tuples, and other data structures. The `...` operator can be used in various contexts, such as: * Creating a new array from an existing one: `let result = [...array];` * Destructuring objects or arrays into individual variables: `let [first, ...rest] = array;` **Other Alternatives** If you're interested in exploring alternative approaches to creating arrays or slices, consider the following options: 1. **`Array.prototype.map()`**: While not a traditional slice or spread operation, `map()` can be used to create new arrays from existing ones by applying a transformation function to each element. 2. **`Array.prototype.filter()`**: Similar to `map()`, `filter()` can be used to create new arrays by selecting specific elements from an original array based on a predicate function. Keep in mind that these alternatives may not provide the same level of conciseness or control as the traditional slice method or the spread operator, respectively.
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