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Powers of two
(version: 0)
If they should be written in an array or in the loop as we go
Comparing performance of:
for with if vs 2x for vs 2x for charcode-48
Created:
8 years ago
by:
Guest
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Tests:
for with if
var j = "MSKU947765"; var s = 0; var r = [1,2,4,8,16,32,64,128,256,512]; for (var e=0;e<10;e++) { if (e<4) { var c = j.charCodeAt(e)-55; s+=(Math.floor(c/10.2)+c)*r[e]; } else { s+=Number(j.charAt(e))*r[e]; }; }; var d = s % 11 % 10; return d;
2x for
var j = "MSKU947765"; var s = 0; var r = [1,2,4,8,16,32,64,128,256,512]; for (var e=0;e<4;e++) { var c = j.charCodeAt(e)-55; s+=(Math.floor(c/10.2)+c)*r[e]; }; for (var f=0;f<6;f++){ s+=Number(j.charAt(e))*r[e]; }; var d = s % 11 % 10; return d;
2x for charcode-48
var j = "MSKU947765"; var s = 0; var r = [1,2,4,8,16,32,64,128,256,512]; for (var e=0;e<4;e++) { var c = j.charCodeAt(e)-55; s+=(Math.floor(c/10.2)+c)*r[e]; }; for (var f=0;f<6;f++){ s+=j.charCodeAt(e)-48; }; var d = s % 11 % 10; return d;
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Suite status:
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Test case name
Result
for with if
2x for
2x for charcode-48
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N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **Benchmark Definition** The provided JSON represents a benchmark definition for measuring the performance of different approaches to a specific problem: calculating powers of two using a string of hexadecimal digits. In this case, the string is "MSKU947765", and we need to calculate the result modulo 11*10. The goal is to compare the performance of three different approaches: 1. **Loop with if-else**: This approach uses a loop that checks the index `e` against a threshold (4 in this case). If `e` is less than 4, it calculates the corresponding power of two using character codes and concatenation. Otherwise, it uses character code subtraction to directly calculate the result. 2. **2x for**: This approach uses two loops: one for calculating powers of two using character code subtraction, and another for handling the remaining indices (0-3) using character code addition and multiplication. 3. **2x for charcode-48**: This approach is similar to the 2x for approach but uses character code subtraction directly. **Pros and Cons** Here are some pros and cons of each approach: * **Loop with if-else**: + Pros: Efficient use of resources, easy to read and understand. + Cons: May be slower due to the overhead of the `if` statement. * **2x for**: + Pros: Can be faster due to parallel execution of loops. However, may have more variables and complexity. + Cons: Less efficient use of resources, harder to read and understand. * **2x for charcode-48**: + Pros: Simple and efficient way to calculate powers of two using character code subtraction. + Cons: May be slower due to the overhead of character code operations. **Library** There is no explicit library mentioned in the benchmark definition. However, it's worth noting that the `charCodeAt()` method and the `Number()` function are built-in JavaScript functions that can be used for these calculations. **Special JS Features or Syntax** None of the test cases use any special JavaScript features or syntax that would require a deep understanding of the language. **Other Alternatives** If you're interested in exploring alternative approaches, here are some other options: * **Using bitwise operations**: Instead of using character codes and concatenation, you could use bitwise operations to calculate powers of two. * **Using array methods**: You could use array methods like `map()` or `reduce()` to simplify the calculation and improve performance. * **Using a dedicated library**: If you're interested in optimizing your JavaScript code for specific use cases, there are libraries available that provide optimized implementations of common algorithms. Overall, the benchmark definition provides a clear insight into the trade-offs between different approaches to calculating powers of two using a string of hexadecimal digits. By analyzing the pros and cons of each approach, developers can choose the most efficient method for their specific use case.
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