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

1 vote276 views1 answer
How drop model rails
Ruby
0 vote300 views1 answer
Ruby get current datetime
Ruby
0 vote286 views1 answer
Number of trailing zeros in a factorial of a number.
Ruby
0 vote298 views2 answers
Remove ascii characters from string ruby
Ruby
0 vote289 views1 answer
Missing template clients/show with {:locale=>[:en], :formats=>[:pdf],
Ruby
0 vote294 views2 answers
How to remove nested array brackets ruby
Ruby
0 vote279 views1 answer
Will_paginate gem rails
Ruby
0 vote291 views1 answer
Rails store array in database
Ruby
0 vote315 views1 answer
Rails class note reminders
Ruby
1 vote284 views1 answer
Rails parallel tests
Ruby