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last number checker - !
(version: 0)
Comparing performance of:
number list string slice vs number list number divide vs string list string indexing
Created:
3 years ago
by:
Guest
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Script Preparation code:
var DEFAULT_COHORT_TEST_IDS = [0, 1, 2, 3, 4]; var DEFAULT_COHORT_TEST_IDS_STR = ['0', '1', '2', '3', '4']; var getLastTokenOfString = (str) => { if (!str || typeof str !== 'string') return null; return str[str.length - 1]; };
Tests:
number list string slice
DEFAULT_COHORT_TEST_IDS.includes(Number(String(1234).slice(-1)))
number list number divide
DEFAULT_COHORT_TEST_IDS.includes(Number(String(1234)) & 10)
string list string indexing
DEFAULT_COHORT_TEST_IDS_STR.includes(getLastTokenOfString(String(1234)))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
number list string slice
number list number divide
string list string indexing
Fastest:
N/A
Slowest:
N/A
Latest run results:
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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 being tested, compared, and their pros and cons. **Benchmark Definition** The benchmark definition in JSON represents a JavaScript expression that will be executed repeatedly to measure its performance. The definition includes: * `DEFAULT_COHORT_TEST_IDS`: an array of two numbers (0 and 1) * `String(1234).slice(-1)`, `Number(String(1234)) & 10`, or `getLastTokenOfString(String(1234))`: these are functions that extract the last digit of a number These expressions will be compared to determine which one is most efficient. **Options Compared** The options being compared are: * `String(1234).slice(-1)`: uses the `slice()` method to extract the last character of a string * `Number(String(1234)) & 10`: converts the string to a number, performs a bitwise AND operation with 10, and then casts the result back to an integer (essentially extracting the last digit) * `getLastTokenOfString(String(1234))`: a custom function that returns the last character of a string **Pros and Cons** * `String(1234).slice(-1)`: + Pros: simple and straightforward + Cons: can be slower due to the overhead of the `slice()` method * `Number(String(1234)) & 10`: + Pros: efficient use of bitwise operations + Cons: requires casting between string and number types, which can lead to performance issues if not done carefully * `getLastTokenOfString(String(1234))`: + Pros: optimized for extracting a single character from a string + Cons: relies on a custom function, which may not be well-known or widely supported **Library Used** In the provided benchmark definition, no explicit libraries are used. However, it's worth noting that some of the functions (like `slice()`) might rely on internal library implementations. **Special JS Feature/Syntax** The expressions use some special JavaScript features: * `String(1234)` creates a new string from an integer * `Number(String(...))` converts a string to a number, which is a well-known technique for extracting the last digit of a number These features are widely supported in modern browsers. **Other Alternatives** If these options don't meet your performance requirements, you may consider alternative approaches: * Using a dedicated library like `lodash` or `underscore`, which provide optimized functions for string manipulation and number arithmetic * Implementing custom optimizations using assembly code or native JavaScript engines (e.g., V8 in Chrome) * Using a different data structure or algorithm to solve the problem Keep in mind that these alternatives will likely require more expertise and development time, but can potentially lead to significant performance improvements.
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