The map task maps an input to an array of values.
Suppose you have a list of data to input and you want to give each item in the list a numerical placement value. You could use the map task to accomplish this.
In this example, the arr variable is ["a","b","c"] and the values to map are the numerals [1,2,3].
The result that returns is a list of key-value items shown as ["a": 1, "b": 2, "c": 3].
