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for-in vs object.keys (no console) (forked)
(version: 1)
same as the other one but with assigning to other object instead of console.logging
Comparing performance of:
for-in vs Object.keys vs Object.assign
Created:
5 years ago
by:
Registered User
Jump to the latest result
Script Preparation code:
var obj = { 'a': 1, 'b': 1, 'c': 1, 'd': 1, 'e': 1, 'f': 1, 'g': 1 };
Tests:
for-in
var otherObj = {}; for (var i=10000; i > 0; i--) { for (var key in obj) { otherObj[key] = obj[key]; } }
Object.keys
var otherObj = {}; for (var i=10000; i > 0; i--) { Object.keys(obj).forEach(key => { otherObj[key] = obj[key]; }); }
Object.assign
var otherObj = {}; for (var i=10000; i > 0; i--) { otherObj = Object.assign({}, otherObj, obj); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
for-in
Object.keys
Object.assign
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Overview** The main goal of this benchmark is to compare the performance of three different approaches for assigning values from one object to another: 1. `for-in` loop 2. Using `Object.keys()` method 3. Using `Object.assign()` method These approaches are used to copy the properties of an object (`obj`) to a new object (`otherObj`). **Options Compared** The three options being compared are: * **For-in loop**: A traditional loop that iterates over the property names of the `obj` object using the `for-in` statement. * **Object.keys() method**: A method that returns an array-like object containing the property names of the `obj` object. The `forEach()` method is used to iterate over this array and assign values to `otherObj`. * **Object.assign() method**: A method that assigns the properties of one or more source objects to a target object. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * **For-in loop**: + Pros: Simple, straightforward, and easy to understand. + Cons: Can be slower due to the overhead of iterating over property names. * **Object.keys() method**: + Pros: More efficient than the `for-in` loop, as it only iterates over property names. + Cons: May have a higher memory footprint due to the creation of an array-like object containing property names. * **Object.assign() method**: + Pros: Fast and efficient, as it directly assigns properties from one object to another. + Cons: Can be less readable than other approaches, especially for large objects. **Library and Syntax** In this benchmark, no external libraries are used. However, the `Object.keys()` method is a built-in JavaScript method that returns an array-like object containing property names of an object. The `for-in` loop uses a traditional loop syntax with `var i = 10000;` and `while (i > 0)`. The `Object.assign()` method uses the spread operator (`...`) to create a new object and assign properties from one object to another. **Special JS Features** There are no special JavaScript features or syntaxes used in this benchmark. It's a simple comparison of basic loop approaches. **Alternative Approaches** Other alternatives for assigning values from one object to another include: * Using the `Object.entries()` method, which returns an array-like object containing property names and values. * Using a `forEach()` loop with an arrow function to iterate over property names. * Using the `reduce()` method to accumulate properties from an object. Keep in mind that the performance differences between these approaches may vary depending on the specific use case and requirements.
Related benchmarks:
For in vs For of
For in vs Object.keys.forEach
for-in vs object.keys (no console)
for-in vs object.keys - log object
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