An array comprising multiple arrays containing strings

Question

I need help creating a nested array of strings like the one shown below:

let rules : type = [
 ["N"]
 ["N", "N"]
 ["N", "N", "N"]
]

I'm struggling to set the correct type for this array. Can you assist me with this?

Answer 1

Answer №1

There are multiple options available for structuring arrays in TypeScript. One approach is to use true arrays of arrays:

let data : string[][] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

Alternatively, you can define it using Array type notation:

let data : Array<Array<string>> = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

Another possibility is to utilize single-element tuple types, although this may not be the typical use case for tuples:

let data : [string[]] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

or

let data : [string][] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

or

let data : [[string]] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

Answer 2

There are multiple options available for structuring arrays in TypeScript. One approach is to use true arrays of arrays:

let data : string[][] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

Alternatively, you can define it using Array type notation:

let data : Array<Array<string>> = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

Another possibility is to utilize single-element tuple types, although this may not be the typical use case for tuples:

let data : [string[]] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

or

let data : [string][] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];

or

let data : [[string]] = [
 ["A"],
 ["A", "B"],
 ["A", "B", "C"]
];