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Reduce vs dividing editted
(version: 0)
Comparing performance of:
Reduce vs Dividing
Created:
5 years ago
by:
Guest
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Tests:
Reduce
function s(x) { return x.toString().split('').reduce((total, cur) => total += parseInt(cur), 0); } let x = s(123456789);
Dividing
function s(x) { let sum = 0; while (x > 0) { sum += x % 10; x = Math.floor(x / 10) } return sum; } let x = s(123456789);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Reduce
Dividing
Fastest:
N/A
Slowest:
N/A
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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 is tested, compared, and considered in the benchmark. **Benchmark Definition** The benchmark definition is a simple JavaScript function that takes an integer `x` as input and returns the sum of its digits. The function uses two different approaches to calculate the sum: 1. **Reduce**: This approach uses the `toString()` method to convert the number to a string, splits the string into individual characters using `split('')`, and then uses the `reduce()` method to iterate over the characters, converting each character back to an integer using `parseInt()`, and accumulating the results in the `total` variable. 2. **Dividing**: This approach uses a while loop to repeatedly extract the last digit of the number by taking the remainder when divided by 10 (`x % 10`), adds it to the sum, and then removes the last digit from the number by performing integer division by 10 (`Math.floor(x / 10)`). **Comparison** The benchmark compares the performance of these two approaches in calculating the sum of digits for a given input number. **Pros and Cons** * **Reduce**: + Pros: concise and expressive code, leverages built-in `reduce()` method. + Cons: may incur overhead due to string conversion and parsing. * **Dividing**: + Pros: potentially faster due to direct arithmetic operations, avoids string conversion and parsing overhead. + Cons: more verbose code, requires manual loop management. In terms of performance, the **Dividing** approach is likely to be faster since it avoids the overhead of converting the number to a string and parsing its digits. However, the **Reduce** approach is more concise and expressive, which may make it easier to read and maintain for some developers. **Library Usage** There are no libraries explicitly mentioned in the benchmark definition or test cases. The `reduce()` method is a built-in JavaScript function, while the `Math.floor()` and `%` operators are also standard. **Special JS Features/Syntax** The benchmark uses two special features/syntax: 1. **Arrow functions**: The benchmark defines two arrow functions (`s(x) { ... }`) which are concise ways to define small anonymous functions. 2. **Template literals**: The `toString()` method is used with template literals (`x.toString()`) which provide a convenient way to create string values in JavaScript. **Other Alternatives** If you're looking for alternative approaches to calculate the sum of digits, here are a few options: * Using `String.prototype.split('')` and then iterating over the resulting array: `return x.toString().split('').reduce((total, cur) => total += parseInt(cur), 0);` * Using `String.prototype.replace()` with a regular expression to extract individual digits: `return x.toString().replace(/\d/g, (digit) => parseInt(digit));` * Implementing a custom loop to extract and sum the digits, without using built-in methods like `reduce()`: `let sum = 0; while (x > 0) { sum += x % 10; x = Math.floor(x / 10); }` Keep in mind that these alternatives may not be as efficient or concise as the original benchmark definitions.
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