Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Reduce vs map/join
(version: 0)
Comparing performance of:
for vs reduce vs map vs for of
Created:
8 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var strings = []; for (var i=0; i<1000; i++) { strings[i] = ""+i+i; }
Tests:
for
var result = ""; for (var i=0; i<strings.length; i++) { result = result+' x-'+strings[i]; }
reduce
var result = strings.reduce(function(string, i) { return string+'x-'+i+' '; }, "");
map
var result = strings.map(function(i) { return 'x-'+i; }).join(' ');
for of
var result = ""; for (var i of strings) { result += 'x-'+i+' '; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
Fork
Test case name
Result
for
reduce
map
for of
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0
Browser/OS:
Firefox 140 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=611590" width="100%" height="500px"></iframe>
for
182K/s
reduce
98K/s
for of
72K/s
map
61K/s
View exact numbers
Test name
Executions per second
✓
for
182,307 Ops/sec
reduce
97,643 Ops/sec
for of
71,539 Ops/sec
map
61,135 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what is tested, compared, and pros/cons of different approaches. **Benchmark Definition** The benchmark definition represents a test case that can be executed on MeasureThat.net. In this case, we have four test cases: 1. **For**: A traditional `for` loop with indexing (`i`) to concatenate strings. 2. **Reduce**: The `reduce()` method is used to concatenate strings from the `strings` array. 3. **Map/join**: The `map()` function is used to transform each string in the `strings` array, and then the `join()` method is used to concatenate the results. 4. **For of**: A newer `for...of` loop with indexing (`i`) to concatenate strings. **Options Compared** The test cases compare different approaches to concatenating strings: * **For**: Traditional loop with indexing * **Reduce**: Using the `reduce()` method for concatenation * **Map/join**: Using the `map()` function followed by `join()` * **For of**: Newer `for...of` loop with indexing **Pros and Cons** Here's a brief overview of each approach: 1. **For**: Pros: Simple, easy to understand. Cons: Can be slow due to manual string concatenation using the `+` operator. 2. **Reduce**: Pros: Efficient, as it avoids creating temporary strings. Cons: May have performance overhead due to function call and object lookup. 3. **Map/join**: Pros: Concise, easy to read. Cons: Creates temporary arrays and objects, which can lead to performance issues. 4. **For of**: Pros: Modern, readable syntax. Cons: Performance may be slower due to the new loop construct. **Library Usage** There is no explicit library usage in these test cases. However, it's worth noting that the `reduce()` method uses the Array.prototype.reduce() function from the ECMAScript standard. **Special JS Features/Syntax** There are no special JavaScript features or syntax used in these test cases. **Other Alternatives** Other alternatives for concatenating strings could include using string templates (e.g., `StringBuilder`), regular expressions, or third-party libraries like Underscore.js. However, MeasureThat.net's focus is on benchmarking the performance of built-in JavaScript methods and constructs. Keep in mind that these test cases are designed to compare the performance of different approaches to concatenating strings, not to optimize string manipulation in general.
Related benchmarks
Reduce vs map/join
Array<string>.join vs Array<string>.reduce
map and join vs reduce
map and join vs reduce small array
Comments
Confirm delete:
Do you really want to delete benchmark?