Concat,indexof,includes and reverse

• Concat is used to merge arrays.

• index of is used just like string.

• join crates string from array.

• reverse is used for reversing array.

• slice copies portion of an array.

• splice removes or replaces elements.

• concat.array add array together for example:

let cats(‘blue,’kitty)

let dog= ('rusty,'wyatt')

Cats.concat dogs