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Array.from vs Spread (random)
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
6 years ago
by:
Guest
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Tests:
Array.from
var fooSet = new Set(); for(var i=0;i<100;i++) { fooSet.add(Math.floor(Math.random() * 100)); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<100;i++) { fooSet.add(Math.floor(Math.random() * 100)); } var other = [...fooSet];
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Suite status:
<idle, ready to run>
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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):
Let's break down the benchmark and explain what is being tested. **Benchmark Purpose** The purpose of this benchmark is to compare the performance of two ways to create an array from a Set object in JavaScript: `Array.from()` and the spread operator (`...`). The benchmark measures how many executions per second each method can handle. **Options Compared** Two options are being compared: 1. **`Array.from()`**: This method creates a new array by converting all elements of an array-like or iterable object, or an array itself, to an array. 2. **Spread Operator (`...`)**: This operator is used to expand an array expression or a list literal into individual arguments to be passed to a function. **Pros and Cons** * **`Array.from()`**: + Pros: More readable and maintainable code, as it clearly expresses the intention of converting an iterable object to an array. + Cons: May have a higher overhead due to the creation of a new array object. * **Spread Operator (`...`)**: + Pros: More concise and efficient code, as it avoids creating a temporary array object. + Cons: Less readable and maintainable code, as its intent is not as clear. **Library** None, no libraries are used in these test cases. **Special JavaScript Features/Syntax** The benchmark does not use any special JavaScript features or syntax beyond what is standard in modern JavaScript. However, it's worth noting that the `Set` object and the spread operator (`...`) are part of the ECMAScript standard and are widely supported across most modern browsers and JavaScript environments. **Other Alternatives** If you wanted to create an array from a Set object, you could also use the following methods: * **`Array.prototype.slice()`**: This method creates a shallow copy of a portion of an array in the set. However, this approach is less efficient than `Array.from()` or the spread operator. * **Manual Loop**: You can write a manual loop to iterate over the Set object and push each element into a new array. However, this approach is also less efficient than `Array.from()` or the spread operator. In conclusion, the benchmark measures the performance of two ways to create an array from a Set object in JavaScript: `Array.from()` and the spread operator (`...`). The choice between these methods depends on your coding style preferences and performance requirements.
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