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for loop vs map
(version: 0)
Comparing performance of:
for loop vs map vs map with arrow function
Created:
8 years ago
by:
Guest
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Tests:
for loop
const prices = [56, 72, 36, 60]; let newPrices = []; for (let i = 0; i < prices.length; i++) { newPrices.push(prices[i] - (prices[i] * .10)); }
map
const prices = [56, 72, 36, 60]; const mapPrices = prices.map(function (price) { return price - (price * .10); });
map with arrow function
const prices = [56, 72, 36, 60]; const arrowPrices3 = prices.map(price => price - (price * .10));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
for loop
map
map with arrow function
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 what's being tested in the provided benchmark. **Benchmark Definition:** The benchmark is comparing three approaches for iterating over an array and performing a specific operation on each element. **Options compared:** 1. **For loop**: A traditional, iterative approach using a `for` loop to iterate over the array. 2. **Map**: An array method that applies a function to each element of the array. 3. **Map with arrow function**: The same as above, but using an arrow function syntax instead of a traditional function declaration. **Pros and Cons:** * **For Loop**: + Pros: Simple, well-established, and widely supported. + Cons: Can be slower than other approaches due to the overhead of repeated loop iterations. * **Map**: + Pros: Efficient and concise way to perform operations on arrays. Can take advantage of parallel processing in modern browsers. + Cons: May not work as expected if the original array is modified during iteration, and can lead to memory allocation issues if not used carefully. * **Map with Arrow Function**: + Pros: Similar benefits to `Map` as an efficient way to perform operations on arrays. The arrow function syntax can make the code more concise and readable. + Cons: Same limitations as `Map`, plus the potential performance impact of evaluating a lambda function on each iteration. **Library/Function usage:** None of these options explicitly rely on external libraries or built-in functions beyond the standard JavaScript array methods (`map`). **Special JS Features/Syntax:** The benchmark uses arrow function syntax, which is a relatively modern feature introduced in ECMAScript 2015 (ES6). It allows for concise and expressive code by eliminating the need to define separate `function` declarations. **Other alternatives:** If not using the traditional loop or array methods, other approaches might include: 1. **Reduce**: An array method that reduces an array of values to a single output value. 2. **ForEach**: An array method that allows iterating over each element in an array without modifying it. 3. **Custom iterations**: Using `Array.prototype.forEach` and a custom function to iterate over the array. However, these alternatives are less common and may not offer significant performance benefits compared to the traditional loop or array methods. Keep in mind that this benchmark is specifically designed to measure the performance difference between three approaches for iterating over an array. If you need to optimize other aspects of your code, it's essential to consider additional factors like memory allocation, caching, and browser-specific quirks.
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