K
Karthik Nar
I was reading this example:
pt = [ [ "Check", "check" ], [ "Credit card", "cc" ], [ "Purchase
order", "po" ] ]
pt.map {|value| value}
Displays the 2D Array elements as expected => [["Check", "check"],
["Credit card", "cc"], ["Purchase order", "po"]]
but a two-parameter block suppled to map like below:
=> ["check", "cc", "po"]
is able to give me the second element of the 2D array.
i looked in the ruby doc and on the net for examples, but 2D arrays are
typically not covered.
while, i love this functionality, my question is -
How does this 2 parameter variant really work?
How does the array.map "figure out" and pass disp to param1 and value to
param2?
pt = [ [ "Check", "check" ], [ "Credit card", "cc" ], [ "Purchase
order", "po" ] ]
pt.map {|value| value}
Displays the 2D Array elements as expected => [["Check", "check"],
["Credit card", "cc"], ["Purchase order", "po"]]
but a two-parameter block suppled to map like below:
=> ["check", "cc", "po"]
is able to give me the second element of the 2D array.
i looked in the ruby doc and on the net for examples, but 2D arrays are
typically not covered.
while, i love this functionality, my question is -
How does this 2 parameter variant really work?
How does the array.map "figure out" and pass disp to param1 and value to
param2?