Explain the use of the ReadonlyArray in TypeScript.
Instruction: Describe what ReadonlyArray is and provide a scenario where it might be useful.
Context: This question assesses the candidate's knowledge of immutable data structures in TypeScript, specifically the ReadonlyArray.
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ReadonlyArray lets a function read an array without using mutating array methods through that typed reference. It is a compile-time contract, not a frozen runtime object...
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