tipos de datos Array en javascript

Arreglos

> var arr1 = new Array();
undefined
> var arra2 =[];

> arra2
[]
> arr1
[]

> arra2.length
0
> typeof arra2
'object'

> arr3.push('goyo')
4
> arr3
[ 'cat',
  'mat',
  'hat',
  'goyo' ]









delete arr3[2];

> [1,2,3,4,5,6].join(":")
'1:2:3:4:5:6'
> [1,2,3,4,5,6].sort();
[ 1,
  2,
  3,
  4,
  5,

  6 ]