To create an array of size n
and having null
values, you can use Array(n).fill(null)
function. It works in both Javascript and ReactJs. Check out this code example –
arrayOf9Values = Array(9).fill(null);
Example in React JS –
class Board extends React.Component { constructor(props) { super(props); this.state = { squares: Array(9).fill(null), xIsNext: true, }; }
Source: ReactJS Docs