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Reverse string
(version: 0)
Comparing performance of:
Array.from, reverse, join vs Iterate, concat vs Iterate, push, join
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var string = document.documentElement.outerHTML.repeat(100);
Tests:
Array.from, reverse, join
Array.from(string).reverse().join("");
Iterate, concat
var newString = ""; for (let i = string.length - 1; i--;) { newString += string[i]; }
Iterate, push, join
var newChars = []; for (let i = string.length - 1; i--;) { newChars.push(string[i]); } newChars.join("")
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Array.from, reverse, join
Iterate, concat
Iterate, push, join
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 dive into the benchmark provided by MeasureThat.net. **Benchmark Overview** The benchmark measures the performance of three different approaches to reverse a string in JavaScript: 1. Using `Array.from()`, `reverse()`, and `join()` 2. Iterating over the string using a for loop and concatenation 3. Iterating over the string using a for loop, pushing elements onto an array, and joining **Options Compared** The benchmark compares the performance of these three approaches in terms of **Number of executions per second**. **Pros and Cons of Each Approach:** 1. **`Array.from()`, `reverse()`, and `join()`** * Pros: + Concise and readable code + Leverages modern JavaScript features for efficiency * Cons: + May have higher overhead due to the creation of a temporary array 2. **Iterate, concat** * Pros: + Simple and straightforward implementation * Cons: + Inefficient using concatenation ( creates new strings) 3. **Iterate, push, join** * Pros: + More efficient than iterate, concat due to reduced string creation * Cons: + Slightly more complex implementation **Library and Syntax Considerations** The benchmark uses the following JavaScript features: * `Array.from()`: a modern JavaScript method for creating an array from an iterable * `reverse()` and `join()` methods are part of the built-in String prototype, which is accessible in most browsers No special JavaScript features or syntax are used beyond these built-ins. **Other Alternatives** For reversing strings, other approaches could include: * Using a library like Lodash (which provides `reverse`) or Underscore.js (which provides `reverse`) * Implementing a custom reverse function using bitwise operations or string manipulation * Using a different data structure, such as a linked list or deque, to store and manipulate the string However, these alternatives are not included in the benchmark provided. **Benchmark Results Interpretation** The benchmark results show that: * The `Array.from()`, `reverse()`, and `join()` approach performs the best ( highest number of executions per second) * The `Iterate, concat` approach is the slowest * The `Iterate, push, join` approach falls in between these two extremes These results can be useful for identifying which string reversal approach to use in a specific performance-critical context.
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