“Crear matriz de JavaScript con 1 valor” Código de respuesta

Crear matriz de JavaScript con 1 valor

let arr = [42]       // Creates an array with only one element:
                     // the number 42.

let arr = Array(42)  // Creates an array with no elements
                     // and arr.length set to 42.
                     //
                     // This is equivalent to:
let arr = []
arr.length = 42