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Array.from vs new Array using index value
(version: 0)
Comparing performance of:
Array.from vs new Array
Created:
2 years ago
by:
Registered User
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Tests:
Array.from
Array.from({ length: 500 }, (_, idx) => idx + 1);
new Array
new Array(500).fill(0).map((_, idx) => idx + 1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.from
new Array
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
Browser/OS:
Chrome 124 on Windows
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<iframe src="https://measurethat.net/Embed?id=520748" width="100%" height="500px"></iframe>
Test name
Executions per second
Array.from
71502.3 Ops/sec
new Array
625275.8 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks and explain what's being tested on MeasureThat.net. **What is being tested?** The provided JSON represents two individual test cases for benchmarking the performance of creating an array in JavaScript using two different approaches: 1. `Array.from()`: This method creates a new array from an iterable or an array-like object. 2. `new Array()`: This syntax creates a new, empty array with a specified length. The goal is to compare the performance of these two approaches when creating an array with a specific number of elements (500 in this case). **Options compared:** The benchmark tests two options: 1. **`Array.from()`**: Creates a new array from an iterable or an array-like object. 2. **`new Array()`:** Creates a new, empty array with a specified length. **Pros and cons of each approach:** * `Array.from()`: Pros: + More flexible, as it can take an iterable or an array-like object as an argument. + Can be more readable, especially when working with arrays of objects or arrays generated by functions. Cons: + May have a higher overhead due to the creation of a temporary function (the callback function passed to `Array.from()`). * `new Array()`: Pros: + Often considered faster and more efficient, as it doesn't involve creating a temporary function. Cons: + Less flexible, as it requires specifying the length explicitly. **Other considerations:** When choosing between these two approaches, consider the specific use case and requirements. If you need to create an array from an iterable or an array-like object, `Array.from()` might be a better choice. However, if you're working with large arrays and performance is critical, `new Array()` might be a better option. **Library used:** In this benchmark, no libraries are explicitly mentioned. The focus is solely on the JavaScript language itself. **Special JS feature or syntax:** The `Array.from()` method uses a new syntax introduced in ECMAScript 2015 (ES6). It's called "template literals" and allows you to create a string by wrapping expressions inside backticks (`). **Benchmark preparation code:** The provided JSON includes the script preparation code for each test case: ```javascript // Test 1: Array.from() Array.from({ length: 500 }, (_, idx) => idx + 1); // Test 2: new Array() new Array(500).fill(0).map((_, idx) => idx + 1); ``` **Alternative approaches:** Other ways to create an array in JavaScript include: * Using the `Array()` constructor with a function as its argument, like this: `new Array(500).fill(0);` * Using the spread operator (`...`) to create a new array from an existing array or iterable, like this: `[...Array(500)].map((_, idx) => idx + 1)` * Using the `for` loop and creating arrays using the `push()` method, like this: `let arr = []; for (let i = 0; i < 500; i++) { arr.push(i + 1); }` Keep in mind that these approaches may have different performance characteristics and use cases compared to the original two options.
Related benchmarks:
Array.from() vs new Array()
Array.from({ length: n }) vs new Array(n)
Array.from() vs new A
Array.from() vs new Array() with index
Array.from() vs new Array() vs []
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