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lodash isObject vs typeof vs isObjectLike
(version: 0)
Comparing performance of:
isObject vs typeof vs isObjectLike
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js'></script>
Script Preparation code:
var x = {'this': 'is', 'a': 'test', 'object': 52 }
Tests:
isObject
var y = _.isObject(x)
typeof
var y = (x !== null && typeof(x) === 'object')
isObjectLike
var y = _.isObjectLike(x)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
isObject
typeof
isObjectLike
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser/OS:
Chrome 135 on Linux
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Embed Benchmark Result
Test name
Executions per second
isObject
141247632.0 Ops/sec
typeof
155357232.0 Ops/sec
isObjectLike
142293376.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what is tested in the provided benchmark. **Benchmark Overview** The benchmark compares three different approaches to check if an object is a plain JavaScript object (`Object`), an object-like value (with `typeof` checking for `'object'`) or an instance of a custom object type defined by Lodash (`_.isObject()`). **Options Compared** 1. **_.isObject(x)**: This function checks if the input `x` has all the properties and no additional ones, which is similar to a strict equality check using `===`. It's useful when you want to ensure that an object doesn't have any unexpected properties or values. 2. **`typeof x === 'object'`**: This expression uses the `typeof` operator to check if the input `x` has a value type of `'object'`. However, this approach can return false positives for custom objects with a specific prototype chain. 3. **_.isObjectLike(x)**: This function is similar to _.isObject(), but it allows for some minor deviations in object definitions, making it more lenient than the strict equality check. **Pros and Cons** 1. **_.isObject()`**: * Pros: Provides a strict equality check, ensuring no unexpected properties or values. * Cons: Can be slower due to its more complex implementation. 2. **`typeof x === 'object'`**: * Pros: Fast and lightweight, as it only requires a simple type check. * Cons: May return false positives for custom objects with specific prototypes. 3. **_.isObjectLike()`**: * Pros: More lenient than _.isObject(), allowing for some minor deviations in object definitions. * Cons: May return false negatives if the input is not an object-like value. **Lodash Library** The `lodash` library provides a set of utility functions, including `isObject()`, which can be used to simplify code and improve performance. In this benchmark, Lodash's implementation of `isObject()` is compared to the simple `typeof x === 'object'` approach. **JavaScript Features** This benchmark does not explicitly test any special JavaScript features or syntax. However, it does rely on some fundamental concepts, such as: * Object equality checks * Prototype chains * Type coercion using `typeof` The benchmark assumes that the input `x` is a valid JavaScript object (or an object-like value). If `x` were not a valid object, the results would be undefined or incorrect. **Alternatives** Other alternatives for checking if an object is a plain JavaScript object could include: * Using a library like `is-object` which provides a more strict equality check * Implementing your own custom equality check function * Using a testing framework like Jest or Mocha, which provide built-in assertion functions for objects. However, the use of Lodash's `isObject()` and `isObjectLike()` functions is a common pattern in JavaScript development, making this benchmark particularly relevant to developers who are familiar with these utility functions.
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