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reverse number
(version: 0)
Comparing performance of:
string way vs math way
Created:
9 years ago
by:
Guest
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Tests:
string way
var n = 1234567890987654321; var reversed = num.toString().split('').reverse().join(''); Number(reversed)
math way
var n = 1234567890987654; var len = Math.ceil(Math.log(n+1) / Math.LN10); var result = 0; while(len>0){ result=result*10; result = Math.floor(result+n%10); n=n/10; len -- }
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Suite status:
<idle, ready to run>
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Test case name
Result
string way
math way
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 provided benchmark and explain what's being tested, the different approaches compared, their pros and cons, and other considerations. **Benchmark Context** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmarking process involves measuring the execution time of specific JavaScript code snippets on various browsers and devices. **Benchmark Definition JSON** The provided Benchmark Definition JSON contains two test cases: 1. `reverse number`: * This test case measures the performance of reversing a large number (1234567890987654321) using different methods. 2. `math way`: * This test case measures the performance of converting a large number to its reversed representation using mathematical operations. **Approaches Compared** The two approaches compared in these test cases are: 1. **String manipulation**: Reversing the number by splitting it into individual characters, reversing the array, and joining it back together. 2. **Mathematical manipulation**: Converting the number to a scientific notation (using logarithms) and then parsing it to extract the reversed representation. **Pros and Cons of Each Approach** 1. **String manipulation**: * Pros: Easy to understand and implement, works for any positive integer. * Cons: May have performance issues due to string concatenation or array operations. 2. **Mathematical manipulation**: * Pros: Can be more efficient than string manipulation, especially for large numbers. * Cons: Requires understanding of mathematical concepts (logarithms), may not work for non-integer values. **Other Considerations** * The `reverse number` test case is likely designed to stress the browser's handling of large integers and string operations. * The `math way` test case is optimized for performance, as it uses a mathematical approach to extract the reversed representation. **Library Used (if any)** None of the provided benchmark code snippets use external libraries. **Special JS Features or Syntax** There are no special JavaScript features or syntax used in these test cases. They rely on standard JavaScript syntax and built-in functions. **Alternatives** Other approaches for reversing a number could include: 1. **Bitwise operations**: Reversing the bits of each digit to get the reversed representation. 2. **Recursion**: Using recursive function calls to reverse the number. 3. **Algorithmic libraries**: Using specialized libraries like `lodash` or `moment.js` which have built-in functions for manipulating numbers. These alternatives may offer different performance characteristics, depending on the specific implementation and requirements of the benchmark.
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