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for loops vs map 123
(version: 1)
Comparing performance of:
map vs for [k,i]
Created:
3 years ago
by:
Registered User
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Script Preparation code:
var obj = { lorem: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse eu sapien eu elit porttitor hendrerit. Suspendisse potenti. Cras elementum eleifend sem, eget accumsan justo pretium at. Aliquam ac ultrices lacus, in vestibulum nisl. Sed efficitur arcu at posuere varius. Mauris tortor urna, luctus ut enim non, tincidunt posuere ante. Vivamus blandit ipsum pharetra accumsan varius. Sed a bibendum tortor, at tristique quam. Nullam purus velit, tempus non sem vitae, accumsan imperdiet metus. Maecenas vehicula ornare pellentesque. Vestibulum justo leo, mollis sed imperdiet ut, suscipit in massa.", ipsum: "In molestie felis orci, eu porttitor felis consequat at. Duis tristique velit nulla, at ornare ipsum dapibus ac. Aenean commodo velit vitae auctor euismod. Nam dignissim, massa nec pellentesque congue, quam leo luctus orci, ut lobortis ex est nec mi. In eu sollicitudin risus, at lobortis ligula. Nullam vulputate, purus ut consequat iaculis, velit libero semper velit, nec hendrerit turpis elit quis nisl. Integer scelerisque dignissim turpis quis aliquam. Curabitur nisl ipsum, tincidunt a felis vitae, sodales commodo massa.", dolor: "Praesent vulputate venenatis nibh nec hendrerit. Nam et erat nec eros semper fringilla. Mauris orci massa, posuere ut sodales vel, pharetra at leo. Nulla facilisi. Aliquam tincidunt convallis fringilla. Quisque consectetur aliquam blandit. Integer in ante semper, commodo justo cursus, rutrum est. Duis sit amet enim vitae est aliquam laoreet placerat ut massa. In hac habitasse platea dictumst. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Curabitur vehicula tortor vitae vulputate dignissim. In vitae est et massa ultrices cursus et quis nunc. Aliquam eu lacus placerat, aliquet massa fringilla, luctus quam. Nunc a nulla viverra orci viverra mattis sit amet sed dui.", sit: "Duis tempor pharetra mauris, eu egestas sem. Quisque vel ultricies leo. Duis consectetur augue sed ante maximus rutrum. Sed nisl eros, viverra sit amet molestie ullamcorper, ornare in ligula. Morbi quis risus tincidunt enim viverra fringilla eu in quam. Nulla quis feugiat augue. Praesent dignissim ac diam sit amet euismod. Donec dignissim tincidunt rhoncus. Nam vel lectus commodo, ultricies diam egestas, tincidunt massa. Etiam id placerat risus. Nulla semper quam vitae lobortis pellentesque. Etiam in tempor sem. Maecenas eleifend aliquam metus at faucibus.", amet: "In id finibus enim. Morbi vel aliquet eros, vel euismod enim. Sed ex arcu, sodales eget congue a, tempor id est. Ut in rhoncus enim, ac auctor purus. Cras a porta arcu. Aenean convallis quis libero a elementum. Cras varius dapibus ipsum in mattis. Vivamus facilisis, nisi at venenatis imperdiet, ligula dui auctor libero, sit amet consectetur nisi justo rhoncus neque. Suspendisse auctor est eget nulla iaculis ultricies." }
Tests:
map
Object.keys(obj).map(k => { console.log(k, obj[k]); })
for [k,i]
for (const [k,i] of Object.entries(obj)) { console.log(k,i); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
map
for [k,i]
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark definition and options compared, as well as provide pros and cons of each approach. **Benchmark Definition** The benchmark tests two different approaches to iterate over an object: `Object.keys()` with `map()`, and `for...of` loop with destructuring assignment (`[k,i]`). The test case uses a sample JSON object `obj` that contains three properties: `lorem`, `ipsum`, and `dolor`. **Options Compared** 1. **`Object.keys(obj).map(k => {\r\n\tconsole.log(k, obj[k]);\r\n})`**: This approach uses the `Object.keys()` method to get an array of keys from the object, and then applies a transformation function using `map()`. The transformed values are then logged to the console. 2. **`for (const [k,i] of Object.entries(obj)) {\r\n console.log(k,i);\r\n}`**: This approach uses a traditional `for...of` loop with destructuring assignment to iterate over the object's entries. The loop variable is an array with two elements: `[key, value]`, which are then logged to the console. **Pros and Cons of Each Approach** **1. `Object.keys(obj).map(k => {\r\n\tconsole.log(k, obj[k]);\r\n})`** Pros: * Easy to implement and understand * Avoids manual memory management Cons: * May not be as efficient due to the overhead of function calls and map iteration * Can lead to higher memory usage due to the creation of a new array **2. `for (const [k,i] of Object.entries(obj)) {\r\n console.log(k,i);\r\n}`** Pros: * More efficient than the first approach since it avoids function call overhead and uses a built-in loop * Uses less memory since no intermediate array is created Cons: * May be harder to understand for those without experience with modern JavaScript features * Requires support for `for...of` loops in older browsers or environments **Other Considerations** * Both approaches assume that the object's properties are enumerable, which may not always be the case. * The first approach uses a transformation function, while the second approach uses destructuring assignment. This can affect performance and readability. **Libraries Used** None explicitly mentioned in the benchmark definition. However, it is assumed that the `Object.keys()` method and `map()` function are built-in to JavaScript or rely on underlying libraries (e.g., V8 for Chrome). **Special JS Features or Syntax** The benchmark uses modern JavaScript features: * Template literals (`\r\n\tconsole.log(k, obj[k]);`) * Spread syntax (`[k,i]` in the `for...of` loop) * Object destructuring assignment (`const [key, value] = Object.entries(obj)[0]`) (used implicitly in the `for...of` loop) No special JS features or syntax are used in the test case. **Alternatives** Other alternatives to these approaches include: * Using a traditional `for` loop with an index variable: `for (var i = 0; i < obj.length; i++) { console.log(obj[i]); }` * Using a library like Lodash's `forEach()` function to iterate over the object * Implementing a custom iterator or reducer function for more complex iteration scenarios.
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