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Array.prototype.slice vs spread operator (improved)
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
4 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.slice
spread operator
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested, the options compared, their pros and cons, and other considerations. **Benchmark Overview** The benchmark compares two ways to create a copy of an array in JavaScript: using the traditional `Array.prototype.slice()` method and the ES6 spread operator (`[...array]`). **Options Compared** 1. **Traditional `Array.prototype.slice()` method**: This method returns a shallow copy of a portion of an array, starting from the first index (0) up to, but not including, the given end index. 2. **ES6 Spread Operator (`[...array]`)**: This operator creates a new array from an existing array by spreading its elements. **Pros and Cons** * Traditional `Array.prototype.slice()` method: + Pros: widely supported across browsers, easy to read and understand, efficient for large arrays. + Cons: can be slow for small arrays due to the overhead of function calls, may not work as expected when dealing with complex data structures (e.g., objects). * ES6 Spread Operator (`[...array]`): + Pros: concise and readable syntax, fast execution time, works well with most data types. + Cons: may not be supported by older browsers or versions of JavaScript, can be slower than traditional slicing for very large arrays. **Library/Function Used** None, this benchmark only tests built-in JavaScript features. **Special JS Feature/Syntax** The spread operator (`[...array]`) is a new syntax introduced in ES6. It allows creating a new array from an existing one by spreading its elements. **Other Considerations** When dealing with large arrays or complex data structures, traditional slicing using `Array.prototype.slice()` might be more efficient due to the overhead of the spread operator's execution time and potential browser limitations. **Alternatives** If you're interested in comparing other array copying methods, such as: * Using `Array.from()`: This method creates a new array from an iterable source (e.g., an array). * Using `slice.call()`: This method calls the provided function with the elements of the original array as arguments. * Using `array.reduce()`: This method applies a callback function to each element of the array, reducing it to a single output value. You can add additional benchmark test cases for these methods and run them using MeasureThat.net. Please note that you may want to adjust the benchmark script preparation code and HTML preparation code according to your specific requirements.
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