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Reduce vs map/join
(version: 0)
Comparing performance of:
for vs reduce vs map vs for of
Created:
7 years ago
by:
Guest
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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
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Test case name
Result
for
reduce
map
for of
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
10 months 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
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Test name
Executions per second
for
182306.7 Ops/sec
reduce
97643.2 Ops/sec
map
61135.4 Ops/sec
for of
71539.2 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.
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