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underscore.keys vs saltarelle foreach key in keys
(version: 2)
Comparing performance of:
Underscore (array like) vs Saltarelle foreach
Created:
9 years ago
by:
Registered User
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HTML Preparation code:
<script type="text/javascript" src="https://publicstatic.tableausoftware.com/vizql/v_100001608191615/javascripts/mscorlib.js"></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore.js"></script>
Script Preparation code:
var newCss = {}; newCss["test1"] = "test1val"; newCss["test2"] = "test2val"; newCss["test3"] = "test3val"; newCss["test4"] = "test4val"; newCss["test5"] = "test5val"; newCss["test6"] = "test6val"; newCss["test7"] = "test7val"; newCss["test8"] = "test8val";
Tests:
Underscore (array like)
var temp = {}; var keyss = Object.keys(newCss); for (var $t2 = 0; $t2 < keyss.length; $t2++) { var key1 = keyss[$t2]; temp[key1] = newCss[key1]; }
Saltarelle foreach
var temp = {}; var $t1 = ss.getEnumerator(Object.keys(newCss)); try { while ($t1.moveNext()) { var key = $t1.current(); temp[key] = newCss[key]; } } finally { $t1.dispose(); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Underscore (array like)
Saltarelle foreach
Fastest:
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 explanation of the provided benchmark. **Benchmark Overview** The benchmark compares two approaches for iterating over keys in an object: Underscore.js (specifically, its "array like" approach) and Saltarelle foreach. **Underscore.js Approach** In the first test case, the benchmark uses Underscore.js to iterate over the keys of `newCss`: ```javascript var keyss = Object.keys(newCss); for (var $t2 = 0; $t2 < keyss.length; $t2++) { var key1 = keyss[$t2]; temp[key1] = newCss[key1]; } ``` This code uses the `Object.keys()` method to get an array of keys, and then loops through it using a traditional for loop. The resulting object `temp` is populated with values from `newCss`. **Saltarelle foreach Approach** The second test case uses Saltarelle foreach to iterate over the keys: ```javascript var $t1 = ss.getEnumerator(Object.keys(newCss)); try { while ($t1.moveNext()) { var key = $t1.current(); temp[key] = newCss[key]; } } finally { $t1.dispose(); } ``` This code uses the `getEnumerator()` method to create an enumerator for the keys, and then loops through it using a while loop. The resulting object `temp` is populated with values from `newCss`. **Options Compared** The benchmark compares two options: 1. **Underscore.js (array like)**: This approach uses the `Object.keys()` method to get an array of keys and then loops through it. 2. **Saltarelle foreach**: This approach uses a custom enumerator to loop over the keys. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * **Underscore.js (array like)**: + Pros: - Easy to implement - Uses standard JavaScript features + Cons: - May be slower due to the overhead of creating an array - May not be suitable for large datasets * **Saltarelle foreach**: + Pros: - Can be faster due to reduced overhead - Suitable for large datasets + Cons: - Less intuitive and less well-known than Underscore.js - Requires the use of a custom enumerator **Other Considerations** * **Browser Support**: Both approaches are supported by modern browsers, but Saltarelle foreach may require additional setup or polyfills. * **Performance**: The benchmark results show that Saltarelle foreach is slightly faster in this case. However, performance differences may vary depending on the specific use case and dataset size. **Additional Notes** The benchmark also includes a reference to an external library (`mscorlib.js`), which seems to be a tableau-specific library for JavaScript execution. The `Underscore.js` library used in the benchmark is version 1.8.3, which is an older version of the library.
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