Rails array pop first n elements

Ruby pop array

a = [1, 2, 3, 4]
a.pop()
# => 4

Rails array pop first n elements

array = [1, 2, 3, 4, 5, 6]
array.drop(2)

# => [3, 4, 5, 6]

Ruby exclude from slice

# First of all you have to use splat (*) operator. 
# Then instead of using .slice() and .except() together, you can do this is more efficient way.

columns_to_show = ['age', 'gender', 'cast', 'fee_status']
columns_to_show = columns_to_show - hidden_columns if hidden_columns

patient.slice(*columns_to_show).values

patient.slice('age', 'gender', 'cast', 'fee_status').except(*hidden_columns)
 => {"cast"=>"black", "fee_status"=>"paid"}

Source: stackoverflow.com

Similar codes

0 vote321 views1 answer
Rails routes grep
Ruby
6 votes446 views4 answers
Ruby iterate over array
Ruby
0 vote324 views2 answers
How to remove the first element in an array ruby
Ruby
3 votes359 views2 answers
How to check ruby version
Ruby
0 vote310 views1 answer
Rails on_delete cascade not working
Ruby
0 vote318 views1 answer
How to push different branch to heroku
Ruby
0 vote313 views1 answer
Ruby extend
Ruby
0 vote261 views1 answer
Rails don't render if in test environment
Ruby
0 vote318 views1 answer
Including libraries in ruby
Ruby
3 votes359 views1 answer
Ruby string to int
Ruby