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Comparison of three map functions
(version: 0)
There are three map functions. 1. Function with optimizations 2. The most common implementation of map 3. Native map as a function method
Comparing performance of:
MAP vs ARRAY_WITH_NO_LENGTH vs MAP_HOW_ARRAY_METHOD
Created:
3 years ago
by:
Registered User
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Script Preparation code:
function map(arr, callback) { const _length = arr.length; const result = new Array(_length); for (let i = 0; i < _length; i++) { result[i] = callback(arr[i], i, arr); } return result; } function arrayWithNoLength(arr, callback) { const result = []; for (let i = 0; i < arr.length; i++) { result.push(callback(arr[i], i, arr)); } return result; } function mapHowArrayMethod(arr, callback) { return arr.map(callback); }
Tests:
MAP
map(new Array(1000000).fill(1000), (num) => num * 2);
ARRAY_WITH_NO_LENGTH
arrayWithNoLength(new Array(1000000).fill(1000), (num) => num * 2);
MAP_HOW_ARRAY_METHOD
mapHowArrayMethod(new Array(1000000).fill(1000), (num) => num * 2);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
MAP
ARRAY_WITH_NO_LENGTH
MAP_HOW_ARRAY_METHOD
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and benchmark setup. **Benchmark Definition** The benchmark is designed to compare three different approaches to implementing the `map` function in JavaScript: 1. **Function with optimizations**: This implementation uses a custom `map` function that takes an array, callback function, and returns a new array with the results of applying the callback to each element. 2. **The most common implementation of map**: This is likely a reference implementation, which is not shown in the provided JSON. It's assumed to be a widely-used and well-tested implementation. 3. **Native map as a function method**: This approach uses the built-in `map` method, which is a part of the JavaScript language. **Options Compared** The benchmark compares the performance of these three approaches: * Function with optimizations * The most common implementation of map (reference implementation) * Native map as a function method **Pros and Cons** 1. **Function with optimizations**: This approach allows for customization and control over the mapping process. However, it may require more manual memory management and error handling. 2. **The most common implementation of map**: This is likely to be a widely-used and well-tested implementation, but its performance may vary depending on the specific JavaScript engine or version used. 3. **Native map as a function method**: This approach provides the best performance and convenience, as it's a built-in part of the language. However, its behavior may not be explicitly documented in all cases. **Library and Purpose** None of the provided implementations use any external libraries. They are custom implementations of the `map` function. **Special JS Feature or Syntax** The benchmark uses a special JavaScript feature: array methods (`map`, `forEach`, etc.). These methods were introduced in ECMAScript 2015 (ES6) and provide a concise way to iterate over arrays. **Other Alternatives** If you're looking for alternative implementations of the `map` function, you could consider: * Using a library like Lodash or Ramda, which provide utility functions for working with arrays. * Implementing a custom iterator using the `Symbol.iterator` and `next()` methods. * Using a different programming paradigm, such as functional programming with immutable data structures. Keep in mind that these alternatives may have different performance characteristics and use cases compared to the benchmarked implementations.
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Map.forEach vs Array.forEach vs Array.from(Map.prototype.values()).forEach
new Map vs set array to map
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