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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.
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