Benchmark: ramda-adjunct renameKeysWith vs js Object.entries + map2

HTML Preparation code:

<script src="//cdn.jsdelivr.net/npm/ramda@0.24.1/dist/ramda.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/ramda@0.24/dist/ramda.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.min.js"></script>

Script Preparation code:

function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  for (var i = 0; i < 20; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}

var renameBy = R.curry((fn, obj) => R.pipe(R.toPairs, R.map(R.adjust(fn, 0)), R.fromPairs)(obj));

var obj = {}
for (let i=0;i<100; i++){
  obj["Prefix" + makeid()] = i;
}

Tests:

a
Object.entries(obj).map(it => ({ key: it[0].replace('Prefix', ''), count: it[1] }));
b
renameBy(R.replace('Prefix', ''))(obj)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

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Test case name	Result
a
b

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Slowest: N/A

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

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Measuring the performance of different approaches to renaming keys in an object is a common benchmarking task. In this case, we're comparing two methods:

**Method 1: Using `Object.entries()` and `map2`**

This approach involves iterating over the key-value pairs of the object using `Object.entries()`, mapping each pair to a new object with the key modified by replacing `'Prefix'` with an empty string, and then spreading the resulting objects back into an array.

```javascript
Object.entries(obj).map(it => ({ key: it[0].replace('Prefix', ''), count: it[1] }));
```

**Method 2: Using `renameBy()` from Ramda library**

This approach uses the `renameBy` function from the Ramda library to rename the keys of the object. The `renameBy` function takes a key transformation function and an object, returns a new object with the same values but with the specified keys transformed.

```javascript
renameBy(R.replace('Prefix', ''))(obj)
```

**Comparison**

Here's a brief comparison of the two approaches:

* **Method 1 (using `Object.entries()` and `map2`)**:
	+ Pros:
		- Easy to understand and implement.
		- Uses built-in JavaScript methods, so it's likely to be optimized by the browser engine.
	+ Cons:
		- May be slower than using a specialized library like Ramda due to the overhead of dynamic function calls and array manipulations.
* **Method 2 (using `renameBy()` from Ramda library)**:
	+ Pros:
		- More concise and expressive, making it easier to read and maintain.
		- May be optimized by the browser engine since it's a specialized library with known performance characteristics.
	+ Cons:
		- Requires an external dependency (the Ramda library), which may introduce additional overhead.

**Other considerations**

When choosing between these two approaches, consider the following factors:

* Performance: If you prioritize speed, Method 1 using `Object.entries()` and `map2` might be a better choice. However, if performance is not a critical concern, Method 2 using `renameBy()` from Ramda library could provide better readability and maintainability.
* Code complexity: Method 2 is more concise and easier to read, making it a good choice for developers who prioritize code quality over raw performance.

**The role of the Ramda library**

The Ramda library provides a set of functional programming utilities that can be used to simplify and optimize certain tasks. In this case, the `renameBy` function provides a concise way to rename keys in an object without having to iterate over key-value pairs explicitly.

**Special JavaScript features or syntax**

This benchmark does not rely on any special JavaScript features or syntax, so it's accessible to developers with varying levels of expertise.

**Alternatives**

If you'd like to explore alternative approaches, here are a few options:

* Using `Object.fromEntries()` instead of `map2`:
```javascript
Object.fromEntries(Object.entries(obj).map(it => [it[0].replace('Prefix', ''), it[1]]));
```
* Using the `Object.keys()` and `forEach` methods to rename keys:
```javascript
const keys = Object.keys(obj);
keys.forEach((key) => {
  obj[key.replace('Prefix', '')] = obj[key];
});
```

Keep in mind that these alternatives may have different performance characteristics than Method 1 or Method 2, depending on the specific use case and browser engine.

Related benchmarks:

ramda-adjunct renameKeysWith vs js Object.entries + map2 (version: 0)

Comparing performance of: a vs b

Created: 7 years ago by: Guest

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a

b

Suite status: <idle, ready to run>

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Slowest: N/A

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