# defination
            The map() method creates a new array with the results of calling a function for every array element.
            We only discuss here array map inbuild method there is one more way of map where we can create our custom map with key,value pair.

# example
         var numbers = [4, 9, 16, 25];
         numbers.map(x=>console.log(x+1);
# Output
       5
       10
       17
       26