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Array join vs String Concatenation
(version: 0)
Comparing performance of:
Array join (w/ push) vs String concatentation
Created:
3 years ago
by:
Guest
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Script Preparation code:
let resultArr = []; let resultStr = ""; lastName = "lastname"; firstName = "firstName"; middleName = "middleName";
Tests:
Array join (w/ push)
if (lastName) resultArr.push(this.lastName); if (firstName) resultArr.push(this.firstName); if (middleName) resultArr.push(this.middleName); resultStr = resultArr.join(' ');
String concatentation
if (this.lastName) resultStr = `${resultStr} ${this.lastName}`; if (this.firstName) resultStr = `${resultStr} ${this.firstName}`; if (this.middleName) resultStr = `${resultStr} ${this.middleName}`;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array join (w/ push)
String concatentation
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested. **Benchmark Overview** The benchmark is comparing two approaches to concatenate strings: using `String concatenation` with the `${}` syntax and using `Array join` with the `push()` method. **Options Compared** The benchmark is testing two options: 1. **String Concatenation**: This approach uses the `${}` syntax to concatenate strings. For example, `resultStr = `${resultStr} ${this.lastName}`;`. 2. **Array Join**: This approach uses the `push()` method to add elements to an array and then joins them using the `join()` method. For example, `if (lastName) resultArr.push(this.lastName);` followed by `resultStr = resultArr.join(' ');`. **Pros and Cons** Here are some pros and cons of each approach: * **String Concatenation**: + Pros: Easy to read and write, simple syntax. + Cons: Can lead to performance issues if not optimized, creates a new string object each time. * **Array Join**: + Pros: More efficient than string concatenation, can be optimized using techniques like caching the `join()` result. + Cons: More complex syntax, requires creating an array and pushing elements onto it. **Library and Special JS Features** The benchmark uses no libraries or special JavaScript features beyond what's standard in modern browsers. The `${}` syntax is a shorthand for string concatenation, which is a feature introduced in ECMAScript 2015 (ES6). **Benchmark Preparation Code** The preparation code sets up the test environment by defining variables: * `resultArr`: an empty array. * `resultStr`: an empty string. * `lastName`, `firstName`, and `middleName` are set to specific values. **Test Cases** There are two test cases: 1. **Array join (w/ push)**: Tests the performance of using `push()` to add elements to an array and then joining them with `join()`. 2. **String concatenation**: Tests the performance of using `${}` syntax for string concatenation. **Benchmark Results** The latest benchmark results show that Chrome 102 on a desktop, Windows platform executes the "String concatentation" test case much faster than the "Array join (w/ push)" test case. **Other Alternatives** Some alternative approaches to string concatenation and array joining could include: * Using `template literals` instead of `${}` syntax. * Using `Array.prototype.reduce()` or `Array.prototype.forEach()` to concatenate strings. * Using a library like Lodash for string concatenation. * Using a caching mechanism to optimize the performance of the `join()` method. Keep in mind that the best approach will depend on the specific use case and requirements.
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