<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>const text = `Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Integer malesuada. Fusce suscipit libero eget elit. Cras elementum. Pellentesque pretium lectus id turpis. Curabitur sagittis hendrerit ante. Etiam dictum tincidunt diam. Phasellus rhoncus. Nulla non lectus sed nisl molestie malesuada. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Nulla accumsan, elit sit amet varius semper, nulla mauris mollis quam, tempor suscipit diam nulla vel leo.Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Sed elit dui, pellentesque a, faucibus vel, interdum nec, diam. Fusce tellus odio, dapibus id fermentum quis, suscipit id erat. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Maecenas fermentum, sem in pharetra pellentesque, velit turpis volutpat ante, in pharetra metus odio a lectus. Curabitur vitae diam non enim vestibulum interdum. In convallis. Duis pulvinar. Maecenas lorem. Aliquam erat volutpat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Integer lacinia.Aenean fermentum risus id tortor. Fusce susci`;console.log(_.truncate(text, {length: 250, separator: ' '}));const text = `Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Integer malesuada. Fusce suscipit libero eget elit. Cras elementum. Pellentesque pretium lectus id turpis. Curabitur sagittis hendrerit ante. Etiam dictum tincidunt diam. Phasellus rhoncus. Nulla non lectus sed nisl molestie malesuada. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Nulla accumsan, elit sit amet varius semper, nulla mauris mollis quam, tempor suscipit diam nulla vel leo.Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Sed elit dui, pellentesque a, faucibus vel, interdum nec, diam. Fusce tellus odio, dapibus id fermentum quis, suscipit id erat. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Maecenas fermentum, sem in pharetra pellentesque, velit turpis volutpat ante, in pharetra metus odio a lectus. Curabitur vitae diam non enim vestibulum interdum. In convallis. Duis pulvinar. Maecenas lorem. Aliquam erat volutpat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Integer lacinia.Aenean fermentum risus id tortor. Fusce susci`;const indexOfSpace = text.indexOf(' ', length); const spacePos = (indexOfSpace === -1 ? text.length : indexOfSpace) + 1; let substr = text.substr(0, ((spacePos > length && spacePos < (length + 10)) ? spacePos : length)).trim(); if(substr.substr(substr.length - 3) !== '...') { substr += '...'; } console.log(substr);--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| lodash | |
| Custom |
| Test name | Executions per second |
|---|---|
| lodash | 317153.6 Ops/sec |
| Custom | 319802.9 Ops/sec |
Let's break down the benchmark and explain what's being tested, compared, and the pros and cons of each approach.
Benchmark Definition
The benchmark definition is a JSON object that describes the test. It has four properties:
Name: The name of the benchmark (in this case, "Truncate performance").Description: A brief description of the benchmark.Script Preparation Code: An optional code snippet to prepare the environment before running the test. In this case, it's empty.Html Preparation Code: A script tag that loads the Lodash library, which is used in one of the test cases.Individual Test Cases
There are two test cases:
lodash: This test uses the lodash library to truncate a long string. The truncate function takes three arguments: the input string, the desired length, and an optional separator.Custom: This test is a custom implementation that truncates a long string using a simple algorithm. It finds the last space character within a certain range (10 characters before or after the desired length) and trims the string to that point.Options Compared
The two test cases are comparing different approaches to truncate strings:
lodash: Uses the truncate function from Lodash, which is likely optimized for performance.Custom: Implements a custom truncation algorithm using JavaScript's built-in string manipulation functions (indexOf, substr, and trim).Pros and Cons of Each Approach
lodash:Custom:lodash library.Library: Lodash
Lodash is a popular JavaScript utility library that provides various functions, including truncate. The truncate function takes two arguments (input string and desired length) and returns a new string with the input truncated to the specified length. Lodash's implementation is likely optimized for performance and includes features like caching and memoization.
Special JS Feature/Syntax
There is no special JavaScript feature or syntax mentioned in this benchmark. It only uses standard JavaScript functions and libraries (Lodash).
Other Alternatives
If you want to implement a custom string truncation algorithm without using Lodash, you could consider other libraries or frameworks that provide similar functionality, such as:
String.prototype.slice()String.prototype.substr()String.prototype.substring()Alternatively, you could implement your own algorithm using JavaScript's built-in functions and data structures.
