The number of parameters is important for the Array constructor
When the
Array()constructor function is invoked with one numeric argument, it uses that argument as an array length. But when invoked with more than one numeric argument, it treats those arguments as elements for the array to be created.This means that the
Array()constructor cannot be used to create an array with a single numeric element.
For example:
const a = new Array(10);
a; // [ <10 empty items> ]
const b = new Array(10, 20);
b; // [ 10, 20 ]
const a = new Array(10);
a; // [ <10 empty items> ]
const b = new Array(10, 20);
b; // [ 10, 20 ]
To pass the arguments as elements for the array, you can use Array.of():
Array.of() // []; returns empty array with no arguments
Array.of(10) // [ 10 ]; can create arrays with a single numeric argument
Array.of(1, 2, 3) // [ 1, 2, 3 ]
Array.of() // []; returns empty array with no arguments
Array.of(10) // [ 10 ]; can create arrays with a single numeric argument
Array.of(1, 2, 3) // [ 1, 2, 3 ]