Flatten

Javascript function that takes a list of arrays as the argument and returns one array. Example

var numbersArray = [ [1,2,3], [4,5,6], [7,8,9] ]
var result = Flatten(numbersArray)
console.log(result)

Outputs

[ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]