Answer
A readonly struct ensures that all fields remain immutable.
It improves performance by avoiding unnecessary copies.
Quick Answer
A readonly struct guarantees all fields are immutable — the compiler enforces it. This lets the runtime safely pass it by reference internally without defensive copies. Use it for small, value-like objects such as coordinates, colors, or time ranges.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ