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Array.prototype.slice vs spread operator va Array.from
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator vs Array.from
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
Array.from
var params = [ "hello", true, 7 ] var other = Array.from(params);
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.slice
spread operator
Array.from
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 benchmark compares three ways to create an array copy: `Array.prototype.slice()`, the spread operator (`...`), and `Array.from()`. **Options Compared** 1. **`Array.prototype.slice()`**: This method creates a shallow copy of a portion of an existing array. 2. **Spread Operator (`...`)**: This operator creates a new array by spreading elements from an iterable (such as an array). 3. **`Array.from()`**: This method creates a new array from an iterable (such as an array or string). **Pros and Cons** 1. **`Array.prototype.slice()`**: * Pros: Fast, widely supported, and has been the standard way to create array copies for a long time. * Cons: Can be slower than modern alternatives, and may not work well with certain data types (e.g., objects). 2. **Spread Operator (`...`)**: * Pros: Modern, concise, and works well with most data types. * Cons: May have performance issues on older browsers or platforms, and can be less readable for complex use cases. 3. **`Array.from()`**: * Pros: Fast, modern, and works well with most data types. * Cons: Less widely supported than `slice()`, and may have performance issues on older browsers or platforms. **Library Usage** None of the options explicitly use a library in this benchmark. However, if we consider external dependencies (e.g., browser-specific APIs), we might see some variations in performance due to differences in implementation across browsers. **Special JS Features or Syntax** The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015. It's an example of a modern JavaScript syntax that can have different performance characteristics compared to older methods like `slice()`. **Benchmark Preparation Code and HTML Preparation Code** These are not explicitly provided, but it's implied that the test cases assume some basic setup for running the benchmark, such as creating an array with sample data (`params`) and then creating a copy using each of the three options. **Alternatives to Consider** 1. **Other spread operators**: Some older browsers or platforms might use different spread operators (e.g., `Array.prototype.slice.call()`). 2. **Other array creation methods**: Other methods, like `concat()`, could potentially be used as alternatives. 3. **Browser-specific optimizations**: Depending on the specific browser being tested, there might be other optimizations or workarounds for creating array copies. Keep in mind that this is a general analysis, and the actual performance differences between these options may vary depending on the specific use case, data type, and target platform.
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