Benchmark: Optional Chaining (babel) versus _.get lodash

Script Preparation code:

var obj = {a: {b: {c: {d: 1}}}}
var badObj = {}

Tests:

Optional Chaining (babel)
var _obj, _obj$a, _obj$a$b, _obj$a$b$c, _badObj, _badObj$a, _badObj$a$b, _badObj$a$b$c; ((_obj = obj) === null || _obj === void 0 ? void 0 : (_obj$a = _obj.a) === null || _obj$a === void 0 ? void 0 : (_obj$a$b = _obj$a.b) === null || _obj$a$b === void 0 ? void 0 : (_obj$a$b$c = _obj$a$b.c) === null || _obj$a$b$c === void 0 ? void 0 : _obj$a$b$c.d) || 2; ((_badObj = badObj) === null || _badObj === void 0 ? void 0 : (_badObj$a = _badObj.a) === null || _badObj$a === void 0 ? void 0 : (_badObj$a$b = _badObj$a.b) === null || _badObj$a$b === void 0 ? void 0 : (_badObj$a$b$c = _badObj$a$b.c) === null || _badObj$a$b$c === void 0 ? void 0 : _badObj$a$b$c.d) || 2;
Lodash
_.get(obj, "a.b.c.d", 2) _.get(badObj, "a.b.c.d", 2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Optional Chaining (babel)
Lodash

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing the performance of Optional Chaining (introduced in Babel 7) with the Lodash library's `_get` function. The test cases create two objects: `obj` and `badObj`, where `obj` has nested properties (`a`, `b`, `c`, `d`) and `badObj` is an empty object.

**Benchmark Preparation Code**

The script preparation code initializes both objects:
```javascript
var obj = {a: {b: {c: {d: 1}}}};
var badObj = {};
```
This code sets up the test data, ensuring that both `obj` and `badObj` have a similar structure.

**Individual Test Cases**

There are two test cases:

1. **Optional Chaining (babel)**
```javascript
((_obj = obj) === null || _obj === void 0 ? void 0 : (_obj$a = _obj.a) === null || _obj$a === void 0 ? void 0 : (_obj$a$b = _obj$a.b) === null || _obj$a$b === void 0 ? void 0 : (_obj$a$b$c = _obj$a$b.c) === null || _obj$a$b$c === void 0 ? void 0 : _obj$a$b$c.d) || 2;
```
This code uses Optional Chaining to access the `d` property of the nested object. If any of the intermediate properties are `null`, it returns `void 0`. Otherwise, it returns the value of `d`.

2. **Lodash**
```javascript
_.get(obj, "a.b.c.d", 2)
```
This code uses Lodash's `_get` function to access the same nested property `d`. The second argument (2) is the default value returned if any of the intermediate properties are `null`.

**Comparison**

The benchmark compares the execution time of these two approaches. The test cases ensure that both methods return the same result (`2`) when accessing the nested property.

**Pros and Cons**

Optional Chaining (Babel):

Pros:

* More concise and expressive syntax
* Reduces nesting and makes code easier to read

Cons:

* Might be slower due to the overhead of parsing the expression
* May not work in older browsers that don't support Optional Chaining

Lodash:

Pros:

* Widely supported and well-tested library
* Provides a simple and efficient way to access nested properties

Cons:

* Adds an external dependency (Lodash)
* May have performance overhead due to function calls

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, object manipulation, and more. The `_get` function is specifically designed to access nested properties in objects.

**Special JS Feature/Syntax: Optional Chaining**

Optional Chaining is a new syntax introduced in Babel 7 (and supported by modern browsers). It allows you to access nested properties in an object using a dot notation, while avoiding errors if any of the intermediate properties are `null`. The syntax is: `obj.nestedProperty`.

Optional Chaining provides a more concise and expressive way to access nested properties, but it may not work in older browsers or environments that don't support it.

**Alternatives**

Other alternatives for accessing nested properties include:

* Using bracket notation (`obj['a.b.c.d']`)
* Using a recursive function
* Using a library like Lodash (as shown above)

However, Optional Chaining provides a concise and expressive way to access nested properties, making it a popular choice in modern JavaScript development.

Related benchmarks:

Optional Chaining (babel) versus _.get lodash (version: 0)

Comparing performance of: Optional Chaining (babel) vs Lodash

Created: 6 years ago by: Guest

Jump to the latest result

Optional Chaining (babel)

Lodash

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):