Why is [] Swifter than new Array in Swift?

Why [] Is Swiftly Efficient Than new Array?

Curious about performance differences between utilizing [] and new Array for array initialization? Let's delve into the details!

[]: A Swift Solution

Utilizing [] for array instantiation boasts several advantages:

• Direct Array Creation: [] explicitly initializes an array, streamlining the process without requiring an intermediary constructor.
• Faster Lookup: [] skips the lookup process required to identify the Array object in the scope chain when using new Array, resulting in increased speed.
• Lower Tokenization Overhead: The lexical analysis stage produces fewer tokens for [], reducing processing requirements.

new Array: A Multifaceted Approach

In contrast, new Array employs a lengthier route:

• Constructor Invocation: It triggers the Array constructor, adding an implicit function call to the initialization process.
• Scope Chain Exploration: new Array necessitates a traverse of the scope chain to locate the Array variable declaration, demanding additional computation.
• Complex Argument Handling: The Array constructor, being overloaded, necessitates extra checks and considerations based on the arguments supplied.

Performance Implications

Benchmarks affirm the superiority of []. Its optimized tokenization, direct array creation, and reduced function calls contribute to noticeably faster execution times compared to new Array, which requires additional processing steps.

The above is the detailed content of Why is [] Swifter than new Array in Swift?. For more information, please follow other related articles on the PHP Chinese website!