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Array fill method vs for loop vs map
(version: 0)
Array fill method vs for loop performance validation
Comparing performance of:
For Loop fill vs Array Fill vs map
Created:
4 years ago
by:
Guest
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Tests:
For Loop fill
let arrayTest = new Array(10000000); for (let i = 0; i < arrayTest.length; i++){ arrayTest[i] = 0; }
Array Fill
let arrayTest = new Array(10000000).fill(0);
map
Array(10000000).map((_, i) => i);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
For Loop fill
Array Fill
map
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 explain the benchmark and its results. **Benchmark Description** The benchmark is designed to compare the performance of three different methods for filling an array with zeros: 1. **For Loop**: Using a traditional for loop to iterate over each index in the array and assign a value of zero. 2. **Array Fill**: Using the `fill()` method provided by modern JavaScript arrays to fill all elements with a specified value, in this case, zero. 3. **Map**: Using the `map()` function to create a new array with the same length as the original array, but with each element set to its index. **Comparison of Approaches** Here are some pros and cons of each approach: * **For Loop**: + Pros: Simple and easy to understand, works in older browsers that don't support modern array methods. + Cons: Slow due to the overhead of explicit loop control and array indexing. * **Array Fill**: + Pros: Fast and efficient, widely supported across modern browsers. + Cons: May not work in older browsers or environments that don't support `fill()` method. * **Map**: + Pros: Fast and efficient, creates a new array without modifying the original, works in most modern browsers. + Cons: Requires JavaScript version 1.0 (ECMAScript 262) to be supported, may not work in older environments. **Library/External Function Used** None of these methods rely on any external libraries or functions beyond what is built into JavaScript itself. **Special JS Feature/Syntax** None of the benchmark's code uses any special JavaScript features or syntax, making it accessible to a wide range of developers. **Other Alternatives** If you need to fill an array with zeros in a different way, here are some alternatives: * Using `Array.from()` and `new Array(length).fill(0)`: This method is similar to the for loop approach but uses the `from()` function to create an array from an iterable. * Using `Array.prototype.set()`: This method allows you to set multiple values in an array at once, which could be faster than filling a large array with zeros. * Using a custom implementation using bitwise operations: This method involves using bitwise operations to fill the array in place, but it's generally slower and less efficient than the other methods. **Benchmark Results** The benchmark results show that: * The `map()` function performed best, with an average execution rate of 113.22110748291016 executions per second. * The `Array Fill` method performed next, with an average execution rate of 10.132774353027344 executions per second. * The for loop approach performed the slowest, with an average execution rate of 9.837177276611328 executions per second. These results suggest that both `map()` and `Array Fill` are suitable alternatives to the traditional for loop method when filling large arrays with zeros in modern browsers.
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