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Reduce and join in javascript
(version: 0)
Comparing performance of:
Join vs Reduce
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var str = ""; var i; var sArr = []; for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; }
Tests:
Join
str = sArr.join("");
Reduce
str = sArr.reduce((a, v) => a += `${v} `, '');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Join
Reduce
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Android 13; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0
Browser/OS:
Firefox Mobile 122 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=505464" width="100%" height="500px"></iframe>
Join
11K/s
Reduce
8K/s
View exact numbers
Test name
Executions per second
✓
Join
10,507 Ops/sec
Reduce
8,303 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The test measures the performance of two JavaScript methods: `join()` and `reduce()`. Both methods are used to concatenate an array of strings into a single string. **Test Cases** There are two test cases: 1. **Join**: This test case measures the performance of the `join()` method, which concatenates all elements in the `sArr` array with a specified separator (in this case, an empty string). 2. **Reduce**: This test case measures the performance of the `reduce()` method, which applies a callback function to each element in the `sArr` array and returns a single value. **Options Compared** The benchmark compares two approaches for concatenating strings: 1. **join()**: This is the most common way to concatenate an array of strings in JavaScript. 2. **reduce()**: This method uses a callback function to accumulate the values from each element in the array into a single string. **Pros and Cons of Each Approach** * **join()**: + Pros: Simple, efficient, and widely supported. + Cons: Can be slower for very large arrays since it creates an intermediate string object. * **reduce()**: + Pros: Allows for more control over the concatenation process and can be more flexible than `join()`. + Cons: Requires a callback function, which can make the code harder to read and maintain. **Library Usage** In this benchmark, no libraries are explicitly used. However, JavaScript's built-in `Array.prototype.join()` and `Array.prototype.reduce()` methods are being tested. **Special JS Features or Syntax** There are no special JavaScript features or syntax mentioned in the provided benchmark. The code only uses standard JavaScript syntax. **Other Considerations** * **Array Size**: The benchmark uses a large array (`sArr`) with 1000 elements, which can affect the performance of both `join()` and `reduce()`. * **Separator Character**: In this example, an empty string is used as the separator for `join()`, but other characters (e.g., commas or newline characters) could be used depending on the specific use case. **Alternatives** If you're looking for alternative approaches to concatenating strings in JavaScript, here are a few options: 1. **template literals**: Template literals are a more modern way of string interpolation that can be faster than `join()` and `reduce()`. 2. **String formatting functions**: Functions like `sprintf()` or `printf()` from libraries like Moment.js can provide more control over the concatenation process. 3. **Array iteration with for loops**: Using traditional for loops to iterate through the array elements can also be an option, although it may not be as efficient or readable. In summary, this benchmark provides a simple and informative way to compare the performance of two common JavaScript methods: `join()` and `reduce()`.
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