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In some cases Angular functions and callbacks return a ReadonlyArray. But array should be used as usual one, as I don't use some immutable structures like ones in Redux.
So how can I convert ReadonlyArray to a javascript native array?
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A mutable value is one that can be changed without creating an entirely new value. In JavaScript, objects and arrays are mutable by default, but primitive values are not — once a primitive value is created, it cannot be changed, although the variable that holds it may be reassigned.
To make an array immutable or read-only, one of the straightforward ways to achieve is to use the as const syntax after the array itself in TypeScript.
So, are arrays mutable or immutable? In terms of mutability, we say that plain C arrays are immutable because the structure itself cannot change once it has been created.
The ReadonlyArray type describes Array s that can only be read from. Any variable with a reference to a ReadonlyArray can't add, remove, or replace any elements of the array. function foo(arr: ReadonlyArray<string>) { arr.
In this case .concat() or .slice() without parameters can be used.
they create new array based on immutable one. It is kind of shallow copy.
Something similar:
How can I Convert a ReadonlyArray<any> to any[]?
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