Benchmark: Object.assign vs spread operator no $query

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator

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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Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Overview**

The benchmark compares the performance of `Object.assign` with the spread operator (`...`) in JavaScript. The test case uses an object literal to create a new object, assigning some properties from another object using either `Object.assign` or the spread operator.

**Options Compared**

Two options are compared:

1. **Object.assign**: A built-in JavaScript method that copies the values of all enumerable own properties from one or more source objects to a target object.
2. **Spread Operator (`...`)**: A syntax feature introduced in ECMAScript 2015 (ES6) that allows spreading the properties of an object onto another object.

**Pros and Cons**

**Object.assign:**

Pros:

* Widely supported across browsers and Node.js versions
* Easy to read and understand for developers familiar with the method

Cons:

* May be slower than the spread operator due to the overhead of calling a built-in function
* Can lead to unexpected behavior if not used carefully (e.g., when dealing with null or undefined values)

**Spread Operator (`...`):**

Pros:

* Often faster than `Object.assign` due to its inline syntax and reduced overhead
* More concise and expressive for simple object assignments

Cons:

* May not be supported in older browsers or Node.js versions
* Can lead to confusion if not used carefully (e.g., when dealing with nested objects)

**Other Considerations**

* The benchmark uses the same test case for both options, which means the results may not reflect real-world usage scenarios. In a real-world application, you might need to assign properties from an object in different ways.
* The benchmark does not account for edge cases, such as null or undefined values, which can affect performance.

**Library Usage**

None of the test cases use any external libraries.

**Special JS Features/Syntax**

The spread operator (`...`) is a special feature introduced in ECMAScript 2015 (ES6). It allows spreading the properties of an object onto another object using the syntax `obj {...other}`. This feature is not supported in older browsers or Node.js versions.

**Alternative Approaches**

Other approaches to achieve similar results could include:

* Using the `merge` function from libraries like Lodash or Underscore
* Implementing a custom merge function
* Using template literals with object literal syntax (e.g., `${obj} { ...other }`)

Keep in mind that these alternatives may introduce additional overhead, dependencies, or complexity compared to using the spread operator or `Object.assign`.

Related benchmarks:

Object.assign vs spread operator no $query (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

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):