CODEWITHSUNDEEP
angulartypescript
nbar
nbar

Reputation: 6158

Array in array, I get an error: Type '[string, string, number]' is not assignable to type '[]'

I want to have an array full of other array that contain string or numbers:

var mainarray: [] = [];
xy.forEach(function (foo) {
    var subarray: [] = ['test', 'test', 3];
    mainarray.push(subarray);
});

However I get this errors:

 Type '[string, string, number]' is not assignable to type '[]'.
Argument of type '[]' is not assignable to parameter of type 'never'.

How do I have to declare the variable mainarray and subarray so that this works?

(Later I use this array to create a jsonstring)

Upvotes: 0

Views: 85

Answers (3)

Unknown
Unknown

Reputation: 601

I got another error message, while trying to run this code snippet:

Type '[string, string, number]' is not assignable to type '[]'. Types of property 'length' are incompatible. Type '3' is not assignable to type '0'.

So your type declaration should be string[] |number[] or (string | number)[] and not just []. Consequently your code snippet should look like this:

var mainarray: [] = [];
xy.forEach(function (foo) {
    var subarray: string[] | number[] = ['test', 'test', 3];
    orders.push(subarray);
});

Upvotes: 0

ye-olde-dev
ye-olde-dev

Reputation: 1298

not quite sure what you're trying to accomplish here, so I can't provide a better answer without context, but you can do it like this:

let mainarray = [];
let xy = [1,2];

function test() {
     xy.forEach(x => {
         mainarray = [ ...mainarray, ['test', 'test', 3]];
     })

    console.log(mainarray);
}

Upvotes: 0

Ashish Ranjan
Ashish Ranjan

Reputation: 12960

Give the type of your array as:

var mainarray: Array<number | string>[] = [];

Upvotes: 3

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