What does the ReadonlyArray utility (or readonly T[]) do?

Removes mutating methods (push, sort) from the type

Freezes the array at runtime via Object.freeze

Makes all array elements deeply immutable

TypeScript · Middle · Question 38 of 75

What does the `ReadonlyArray<T>` utility (or `readonly T[]`) do?

✓Correct answer: Removes mutating methods (push, sort) from the type
2Freezes the array at runtime via Object.freeze
3Makes all array elements deeply immutable

Explanation

A readonly T[] parameter guarantees the caller that the function won't modify their array. It accepts regular arrays too. The type doesn't prevent changing nested objects - it's shallow protection.

What does the `ReadonlyArray<T>` utility (or `readonly T[]`) do?

Explanation

Further reading

Problem with a question

Test yourself

What does the ReadonlyArray<T> utility (or readonly T[]) do?

Explanation

Further reading

Test yourself

What does the `ReadonlyArray<T>` utility (or `readonly T[]`) do?