Archive for the ‘ruby’ Category
ruby csv to structured hash
I had a csv like this:
object
color
flavor
shape
apple
red
sweet
round
banana
yellow
sweet
long
lemon
yellow
sour
round
and I wanted a ruby hash structured like this:
{
‘apple’=> { ‘color’=>’red’, ‘flavor’=>’sweet’, ’shape’=>’round’},
‘banana’=> { ‘color’=>’yellow’, ‘flavor’=>’sweet’, ’shape’=>’long’},
‘lemon’=> { ‘color’=>’yellow’, ‘flavor’=>’sour’, ’shape’=>’round’}
}
So I wrote this, which does the job:
require "faster_csv"
def csv_to_structured_hash
arr_of_arrs = FasterCSV.read( ‘your.csv’ )
stuff = {}
header = arr_of_arrs.shift
arr_of_arrs.each_with_index do |row, i|
thing = { row[0] => {} }
header.each_with_index do |col, header_index|
thing[ [...]
Ruby conversion module
This is a ruby module useful for conversions dealing with length, weight, torque.
module Convert
def Convert.number_with_precision(number, precision=2)
“%01.#{precision}f” % number
rescue
number
end
def Convert.mm_to_in(mm, precision=2)
number_with_precision(mm * 0.03937, precision)
end
def Convert.in_to_mm(inches, precision=2)
number_with_precision(inches / 0.03937 , precision)
end
def Convert.feet_to_meters(f, precision=2)
number_with_precision( f * 0.3048, precision)
end
def Convert.meters_to_inches(m, precision=2)
number_with_precision( m * [...]
