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Array.from vs ...
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
2 years ago
by:
Guest
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Tests:
Array.from
var fooMap = new Map(); for(var i=0;i<100;i++) { fooMap.set(i, i); } var other = Array.from(fooMap);
Spread
var fooMap = new Map(); for(var i=0;i<100;i++) { fooMap.set(i, i); } var other = [...fooMap];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.from
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand the provided JSON benchmark. **Overview** The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of two approaches: `Array.from` and the spread operator (`...`) for creating an array from a Map object. The benchmark measures how many executions per second each approach can handle. **Options Compared** 1. **`Array.from(fooMap)`**: This approach creates an array by calling the static method `Array.from()` on the `fooMap` object, passing it as an argument. The spread operator (`...`) is not used explicitly in this case. 2. **` [...fooMap]`**: This approach uses the spread operator to create a new array from the elements of the `fooMap` object. **Pros and Cons** * **`Array.from(fooMap)`**: + Pros: Simple and straightforward, easy to understand for most developers. + Cons: May be slower than using the spread operator due to the overhead of calling an external method. * **`[...fooMap]`**: + Pros: More concise and potentially faster since it avoids the overhead of calling `Array.from()`. + Cons: Less intuitive for some developers, as it relies on a lesser-known feature. **Other Considerations** Both approaches have similar performance characteristics since they both create an array by iterating over the elements of the Map object. However, using the spread operator may be slightly faster due to its optimized implementation in modern JavaScript engines. **Library and Purpose** In this benchmark, no external libraries are used. The `Map` class is a built-in object in JavaScript that provides a way to store key-value pairs. **Special JS Features or Syntax** The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) as a new syntax for creating arrays from iterable objects, including Maps. While it's not essential for this benchmark, it's worth noting for developers familiar with ES6 features. **Other Alternatives** If the spread operator is not available or not preferred, other alternatives to create an array from a Map object include: * Using `Array.prototype.concat()` and passing the map as an argument: `Array.prototype.concat.call([], fooMap)` * Converting the Map to an array using `Object.values()`: `Object.values(fooMap)` However, these approaches may not be as concise or performant as using the spread operator or `Array.from()`.
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