Sometimes, we want to declare an empty two-dimensional array in JavaScript.
In this article, we’ll look at how to declare an empty two-dimensional array in JavaScript.
How to declare an empty two-dimensional array in JavaScript?
To declare an empty two-dimensional array in JavaScript, we can use the array fill method.
For instance, we write
const matrix = new Array(5).fill(0).map(() => new Array(4).fill(0));
to call Array with 5 to create an array with 5 empty slots.
Then we call fill to fill the slots with undefined.
Next we call map with a callback to return an array with 4 empty slots and fill them with 0 with fill.
Conclusion
To declare an empty two-dimensional array in JavaScript, we can use the array fill method.
