initializeArrayWithValues

Initializes and fills an array with the specified values.

• Use Array.from() to create an array of the desired length, Array.prototype.fill() to fill it with the desired values.
• Omit the last argument, val, to use a default value of 0.

const initializeArrayWithValues = (n, val = 0) =>
  Array.from({ length: n }).fill(val);

initializeArrayWithValues(5, 2); // [2, 2, 2, 2, 2]

Example

MDN