Can anyone explain this line of code?
puts “nercpyitno”.gsub(/(?.)(?.)/, ‘\k\k’)
The textbook states that the result of this code is ‘encryption’.
How does this method go about performing its task?
Bruce H. wrote in post #1175907:
Can anyone explain this line of code?
puts “nercpyitno”.gsub(/(?.)(?.)/, ‘\k\k’)
The textbook states that the result of this code is ‘encryption’.
How does this method go about performing its task?
A)
“nercpyitno”.gsub(/(.)(.)/, ‘\2\1’)
=> “encryption”
this mean that for 2 consecutives chars, inverse their order, for
all the string.
B)
/(?.)(?.)
main for 2 consecutive chars, use name group (?…) for mark
‘c1’ the first char, ‘c2’ the second
Ruby api: “Capture groups can be referred to by name when defined
with the (?) or (?‘name’) constructs.”
C)
‘\k\k’
mean put name group ‘c2’ and the name groupe ‘c1’
ruby api: “Named groups can be backreferenced with \k,
where name is the group name.”
I understand the code now. Am I correct to say that the point here is to
subdivide the string into sets of 2 and within each set, invert their
current order.
So ne->en, rc->cr, py->yp, it->ti, no->on
I understand now, thanks for your very detailed explanation! The
textbook did not really provide an explanation
Regis d’Aubarede wrote in post #1175910:
Bruce H. wrote in post #1175907:
Can anyone explain this line of code?
puts “nercpyitno”.gsub(/(?.)(?.)/, ‘\k\k’)
The textbook states that the result of this code is ‘encryption’.
How does this method go about performing its task?
A)
“nercpyitno”.gsub(/(.)(.)/, ‘\2\1’)
=> “encryption”this mean that for 2 consecutives chars, inverse their order, for
all the string.B)
/(?.)(?.)
main for 2 consecutive chars, use name group (?…) for mark
‘c1’ the first char, ‘c2’ the secondRuby api: “Capture groups can be referred to by name when defined
with the (?) or (?‘name’) constructs.”C)
‘\k\k’
mean put name group ‘c2’ and the name groupe ‘c1’ruby api: “Named groups can be backreferenced with \k,
where name is the group name.”