Types when destructuring arrays

Question

function f([a,b,c]) {
  // this works but a,b and c are any
}

it\'s possible write something like that?

function f([a: number,b: nu         


        

Answer 1

my code was something like below

type Node = { 
    start: string;
    end: string;
    level: number;
};

const getNodesAndCounts = () => { 
    const nodes : Node[]; 
    const counts: number[];
    // ... code here

return [nodes, counts];
}

const [nodes, counts] = getNodesAndCounts(); // problematic line needed type

typescript was giving me error in line below TS2349: Cannot invoke an expression whose type lacks a call signature;

nodes.map(x => { 
//some mapping; 
    return x;
);

Changing line to below resolved my problem;

const [nodes, counts] = getNodesAndCounts();