assuming i got this input .txt
10000, 150
345, 32
When i have initialized from an input file into a class like this:
class A
def initialize(b,c)
@b = b
@c = c
end
end
input = File.open("data", "r")
input.each do |line|
l = line.split(',')
arr << A.new(l[0], l[1])
end
p arr
i get this output [#A:0x00000002816440 @b="10000", @c=" 150">
how can i get it to an array like this
[[10000, 150][345, 32]]
Improvement suggested by Neil.
File.readlines("input.txt").map{|s| s.split(",").map(&:to_i)}
# => [[10000, 150], [345, 32]]
class A is not relevant - i.e. the two-part arrays are the best representation of the data in the rest of the code. Except I'm not so sure about use of split($/) - why not just use File#each_line?
File.each_line is not defined in Ruby 2.1. Maybe it has been deprecated.File.open("input.txt").each_line - so File.readlines is a better choice anyway.Assuming input.txt contains the below data :
10000, 150
500, 10
8000, 171
45, 92
I can think of as below :
class A
def initialize(b,c)
@b = b
@c = c
end
def attrs
instance_variables.map{|var| instance_variable_get(var).to_i}
end
end
input = File.open('/home/kirti/Ruby/input.txt', "r")
ary = input.each_with_object([]) do |line,arr|
l = line.split(',')
arr << A.new(*l).attrs
end
ary
# => [[10000, 150], [500, 10], [8000, 171], [45, 92]]
I think you can do two things:
Convert the string inputs to numbers
Assuming you have further use for the class A, add a .to_a method to the class
You could do the first part in multiple places, but a simple thing to do is have the class sort out the conversion. Then the resulting code would look like this:
class A
def initialize(b,c)
@b = b.to_i
@c = c.to_i
end
def to_a
[ @b, @c ]
end
end
input = File.open("data", "r")
input.each do |line|
l = line.split(',')
arr << A.new(l[0], l[1]).to_a
end
p arr
class Ato have the string versions of the params, or is it part of exploring how to get the end result?