Benchmark: underscore.keys vs saltarelle foreach key in keys

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>

Previous results

Test case name	Result
Underscore (array like)
Saltarelle foreach

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

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.

Related benchmarks:

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

Jump to the latest result

Underscore (array like)

Saltarelle foreach

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):