Split a string [var str="How are you doing today?"] in different ways:

The output of the code above will be:
str.split()      = How are you doing today?
str.split(' ')   = How,are,you,doing,today?
str.split('')    = H,o,w, ,a,r,e, ,y,o,u, ,d,o,i,n,g, ,t,o,d,a,y,?
str.split(' ',3) = How,are,you