I have an object like this:
{
"address": ["line1", "line2", "line3"]
}
How to define address in an interface? the number of elements in the array is not fixed.
5 Answers
interface Addressable {
address: string[];
}
An array is a special type of data type which can store multiple values of different data types sequentially using a special syntax.
TypeScript supports arrays, similar to JavaScript. There are two ways to declare an array:
- Using square brackets. This method is similar to how you would declare arrays in JavaScript.
let fruits: string[] = ['Apple', 'Orange', 'Banana'];
- Using a generic array type, Array.
let fruits: Array<string> = ['Apple', 'Orange', 'Banana'];
Both methods produce the same output.
Of course, you can always initialize an array like shown below, but you will not get the advantage of TypeScript's type system.
let arr = [1, 3, 'Apple', 'Orange', 'Banana', true, false];
It's simple as this:
address: string[]
Or:
{ address: Array<string> }
I think the best way to do it is something like: type yourtype = { [key: string]: string[] }
