How to define a `typescript array of strings` in an interface?

General Discussions
1

How to define a typescript array of strings in an interface?

I have an object like this:

{
  "address": ["line1", "line2", "line3"]
}

How can I define the address property in an interface when the number of elements in the array is not fixed?

2

Hi

It’s the most common question that I think even I faced issue when I started my coding jounery. Heres what I follow:

Using a simple array type: You can define the address property as a generic array of strings in the interface like this:

interface MyObject {
  address: string[];
}

This allows the address property to hold an array of any number of strings.

3

If you want to specify that the array should hold strings but the number of elements is not fixed, you can use a tuple type that allows for an indefinite number of strings:

interface MyObject {
  address: string[]; // This works just like an array, with no specific length constraint
}
4

If you want to enforce some range for the number of elements in the array, you could use something like the following. However, this is less flexible:

interface MyObject {
  address: [string, ...string[]];  // The first element is required, and the rest can be strings.
}

Each solution ensures the address is a typescript array of strings and can accommodate varying lengths.