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sudo docker-compose rm --all &&
sudo docker-compose pull &&
sudo docker-compose build --no-cache &&
sudo docker-compose up -d --force-recreate

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following scenario: log

Webpack HOT dev build for Rails
Unhandled 'error' event
rake aborted!
SignalException: SIGTERM

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bundle _1.17.3_ install

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# given an array of hashes x:
x = [{"a" => 10}, {"b" => 20}, {"c" => 30}]

# return all the keys: ["a", "b", "c"]
x.flat_map(&:keys)

# return all the values: [10, 20, 30]
x.flat_map(&:values)

# return the sum of values: 60

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# 1st
# 48ms
def running_sum(nums)
  result = []
  nums.inject(0) do |acc, n|
    result << acc + n
    acc + n
  end
  result
end

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# 1st
# 56 ms
def find_numbers(nums)
  count = 0
  nums.each do |n|
    count += 1 if n.digits.size.even?
  end
  count
end

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File Modes

Ruby supports the following file modes:

r read-only, starts at beginning of file (default mode).
r+ read-write, starts at beginning of file.
w write-only, truncates existing file to zero length or creates a new file for writing.
w+ read-write, truncates existing file to zero length overwriting existing data or creates a new file for reading and writing.
a write-only, appends to end of file if file exists, otherwise creates a new file for writing.
a+ read-write, appends or reads from end of file if file exists, otherwise creates a new file for reading and writing.

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=begin
Given a list of 24-hour clock time points in "Hour:Minutes" format, find the minimum minutes difference between any two time points in the list.
 * 
 * Example 1:
 * Input: ["23:59","00:00"] should return 1

 * Example 2:
 * Input: ["03:12","01:00", "03:10"] should return 2
=end

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class Matrix
  def call(string)
    puts "rows:"
    puts show_rows(string)
    puts "columns:"
    puts show_columns(string)
  end
  
  private
  

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.transpose()

Assumes that self is an array of arrays and transposes the rows and columns.

a = [[1,2], [3,4], [5,6]]
a.transpose   #=> [[1, 3, 5], [2, 4, 6]]

.in_groups_of(number, fill_with = nil)

rails method