Benchmark: Object assignments

Tests:

Brackets
let ob = {a:1,b:2}; ob['c'] = 3;
point
let ob = {a:1,b:2}; ob.c = 3;
Object.assign
let ob = {a:1,b:2}; Object.assign(ob,{c:3});
Object assign 2
let ob = {a:1,b:2}; ob = Object.assign({},ob,{c:3});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Brackets
point
Object.assign
Object assign 2

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 its test cases.

**Benchmark Overview**

The "Object assignments" benchmark tests how browsers handle object property assignment using different methods: bracket notation (`[]`), dot notation (`.`), and `Object.assign()`. The benchmark aims to measure the performance of these methods in assigning properties to objects.

**Test Cases**

There are four individual test cases:

1. **Brackets**: Assigns a new value to a non-existent property `c` using bracket notation: `ob['c'] = 3;`
2. **point**: Assigns a new value to an existing property `c` using dot notation: `ob.c = 3;`
3. **Object.assign**: Assigns a new object with a single property `c` to an existing object using the `Object.assign()` method: `Object.assign(ob,{c:3});`
4. **Object assign 2**: Assigns a new object with a single property `c` to an existing object using the `Object.assign()` method, but wraps it in another assignment statement: `ob = Object.assign({},ob,{c:3});`

**Library Used**

In all test cases, the `Object` library is used. Its purpose is to provide methods for working with objects, including property access and manipulation.

**Special JS Feature/Syntax (None)**

There are no special JavaScript features or syntax used in these test cases. They only rely on standard ECMAScript syntax for object assignments.

**Comparison of Methods**

The benchmark compares the performance of three methods:

1. **Brackets**: `ob['c'] = 3;` - This method uses bracket notation to access and assign properties.
2. **point**: `ob.c = 3;` - This method uses dot notation to access and assign properties.
3. **Object.assign()**: `Object.assign(ob,{c:3});` - This method uses the `Object.assign()` function to copy properties from one object to another.

**Pros and Cons**

Here are some pros and cons of each method:

1. **Brackets**:
	* Pros: Can be used for both existing and non-existent properties.
	* Cons: May incur a performance penalty due to string comparison.
2. **point**:
	* Pros: Fastest performance, as it uses direct property access.
	* Cons: Only works for existing properties, and may throw errors if the property doesn't exist.
3. **Object.assign()**:
	* Pros: Can be used for both existing and non-existent properties, and provides a safety net against errors.
	* Cons: May incur a performance penalty due to function call overhead.

**Alternatives**

Other alternatives for object assignment include:

1. **Destructuring assignment**: `const { c } = ob;` followed by `ob.c = 3;`
2. **Spread operator**: `Object.keys(ob).forEach((key) => (ob[key] = 3));`

However, these methods are not tested in this benchmark.

**Additional Considerations**

When working with object assignments, it's essential to consider the following:

1. **Property existence**: Be aware that using dot notation (`.`) or bracket notation (`[]`) may throw errors if the property doesn't exist.
2. **Performance**: Use the most efficient method for your specific use case, taking into account factors like performance and security.
3. **Security**: When using `Object.assign()`, ensure that you're only assigning trusted data to prevent potential security vulnerabilities.

I hope this explanation helps software engineers understand the "Object assignments" benchmark and its test cases!

Related benchmarks:

Object assignments (version: 0)

Comparing performance of: Brackets vs point vs Object.assign vs Object assign 2

Created: 7 years ago by: Guest

Jump to the latest result

Brackets

point

Object.assign

Object assign 2

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):