angular2 array of boolean

Question

When declaring this :

public isCollapsedDet : boolean[][];
public isCollapsedCyc : boolean[] ;

I got the following error message :

/nestedForm/src/app/app.component.ts (95,7): Type 'boolean' is not assignable to type 'boolean[][]'.

I just need to get array as the following :

isCollapsedCyc[0] = true;
isCollapsedCyc[1] = false;
//
isCollapsedDet[0, 0] = true;
isCollapsedDet[0, 1] = true;
isCollapsedDet[1, 0] = false;
isCollapsedDet[1, 1] = true;

Answer 1

You cannot add values to an array by nesting them with comma. Type boolean[][] means that there will be an array of arrays of booleans, so something like for example:

[[true, false], [false, true]] // this is boolean[][] or Array<Array<boolean>>

if you want to set the value for it, you need to nest it as an ordinary array:

isCollapsedDet[0, 0] = true; 
    // error - comma has nothing to do there
isCollapsedDet[0][0] = true; 
    // success - element isCollapsedDet[0][0] in array isCollapsedDet[0] is true

More about arrays in TypeScript can be found here - and a bit more advanced types here

Some useful answers found here: Multidimensional array initialization

Other links: TypeScript Multidimensional Arrays