Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Spread vs object assign v100
(version: 0)
Comparing performance of:
spread vs assign
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
spread
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject, secondObject);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
spread
assign
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The benchmark definition is essentially a description of what needs to be measured and compared between different approaches. In this case, there are two test cases: 1. "Spread" - This test case uses the spread operator (`...`) to merge two objects into one. 2. "Assign" - This test case uses the `Object.assign()` method to achieve the same result as the "Spread" approach. **Options Compared** The benchmark is comparing the performance of these two approaches: * **Spread Operator**: The spread operator (`...`) is a new syntax introduced in ECMAScript 2018 (ES2018). It allows you to expand an object into multiple arguments, or merge two objects together. * **Object.assign() Method**: This method is used to create a new object by copying properties from one or more source objects. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: ### Spread Operator Pros: * More concise and readable code * No need to explicitly create an empty object before merging * Faster and more efficient for small objects Cons: * Not supported in older browsers (pre-ES2018) * Can be slower than `Object.assign()` due to the additional overhead of parsing and executing the spread operator ### Object.assign() Method Pros: * Widespread support across older browsers and environments * Allows for more control over the merging process (e.g., specifying a target object) Cons: * Requires creating an empty object before merging, which can lead to unnecessary memory allocation. * Can be slower than the spread operator due to the additional overhead of parsing and executing the method. **Library and Purpose** There is no explicit library mentioned in this benchmark. The `Object.assign()` method is a built-in JavaScript method that comes with the language itself. **Special JS Feature or Syntax** The spread operator (`...`) is a new syntax introduced in ECMAScript 2018 (ES2018). It's not supported in older browsers, but it provides a more concise and readable way to merge objects. MeasureThat.net is likely using this feature to demonstrate its performance compared to the `Object.assign()` method. **Other Alternatives** Some alternative approaches for merging objects include: * Using the `lodash` library, which provides a `mergeObjects()` function. * Creating an empty object using the `{}` constructor and then assigning properties from both sources. * Using the `reduce()` method to merge two objects into one. However, these alternatives may not be as efficient or concise as the spread operator or `Object.assign()` method.
Related benchmarks:
toFixed -> Number vs Math.round
toFixed() vs Math.round().toString()
parseFloat(toFixed) vs Math.round()
toFixed vs Math.round() with numbers222
toFixed vs Math.round vs |(bitwise or)
Comments
Confirm delete:
Do you really want to delete benchmark?