Is in Typescript possible to define 'object of arrays of type string? (right position of type checking?)

Question

I know in typescript an object can be typed either by ClassName (ES6 class) or by 'any'.

I also know you can define an array of string (string[]) and even an array of arrays of string (string[][]).

I need to express the type of an object whose properties are only arrays of type string.

e.g.

export var MY_VAR: any = {
    <string[]> p1: [...]
}

I tried with something like any following object_name: but not luck.

I also tried any following object_name and before each object's array.

In either case I have syntax errors (see example above)

EDIT apparently

export var MY_VAR: any = {
    <string[]> p1: [...]
}

works instead. however I don't understand what the difference is

Nitzan Tomer · Accepted Answer · 2016-04-26 09:10:15Z

30

It's not very clear what you're asking for, but if I managed to get you right then:

interface MyType {
    [key: string]: string[];
}

Or inline:

let myArrays: { [key: string]: string[] } = {};

answered Apr 26, 2016 at 9:10

Nitzan Tomer

166k51 gold badges330 silver badges307 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

dragonmnl Over a year ago

thanks. can you just clarify the difference between <string[]> p1 and p1: string[] (see my 1st and 2nd example)?

Nitzan Tomer Over a year ago

Basically <string[]> p1 means casting p1 to a string array (string[] which is like Array<string>). But in your example you cast the key to be a string array instead of the value. But even if you'd cast the value, it's just one specific value, it means nothing about the object itself (which you defined as any)

Collectives™ on Stack Overflow

Is in Typescript possible to define 'object of arrays of type string? (right position of type checking?)

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related