Overview of the Benchmark

The provided benchmark measures the performance difference between two approaches to access values in an object: Object.keys and Object.values. The test creates an object with 1000 properties, each initialized with a unique value.

Options Compared

Two options are compared:

1. Object.keys: Returns an array of strings representing the keys of the object.
2. Object.values: Returns an array of values of the object.

Pros and Cons of Each Approach

• Object.keys:
  • Pros: More explicit control over accessing object properties, can be used for iteration with custom key-value pairs.
  • Cons: Requires additional indexing to access values (obj[key]), which can lead to slower performance due to string lookup.
• Object.values:
  • Pros: Faster access to values since it avoids string lookup and directly returns the values as an array. However, it only provides direct access to object values without iteration capabilities.
  • Cons: Less flexible for custom iteration logic.

Library Used (None)

No specific library is used in this benchmark. The test relies solely on built-in JavaScript features.

Special JS Feature/Syntax

There are no special JavaScript features or syntaxes explicitly mentioned or utilized in the provided code.

Other Alternatives

If you needed to access object properties, some other alternatives could be considered:

• Using a for...in loop directly on the object (similar to using Object.keys but potentially slower due to string lookup): for (var key in obj) { console.log(obj[key]); }
• Utilizing modern JavaScript features like Object.entries() or Array.from(): Object.entries(obj).forEach(([key, value]) => { console.log(value); });

However, for simple access cases with direct values, using Object.values is still the recommended approach due to its performance benefits.

Benchmark Preparation Code Analysis

The provided preparation code creates an object (obj) and populates it with 1000 properties. The script then uses a loop to iterate over these properties, assigning each property a unique value between 0 and 999.

Individual Test Cases Analysis

Two test cases are defined:

• Object.keys: Uses Object.keys() to get an array of keys from the object and then iterates through this array using a forEach callback function to log the corresponding values.
• Object.values: Directly uses Object.values() to get an array of values from the object, iterating over it with another forEach callback function to log each value.

These test cases are intended to compare the performance and behavior of these two approaches in a simple scenario.