Class: Darthjee::CoreExt::Array::HashBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/darthjee/core_ext/array/hash_builder.rb

Overview

Class responsible for building a Hash from 2 arrays

Examples:

Building the hash from the array

values = [10, 20, 30]
keys   = %i[a b c]
builder = Darthjee::CoreExt::Array::HashBuilder.new(values, keys)

builder.build  # returns { a: 10, b: 20, c: 30 }

Rebuilding a hash from values and keys

hash = { a: 20, b: 200, c: 2000 }
builder = Darthjee::CoreExt::Array::HashBuilder.new(
  hash.values,
  hash.keys
)

builder.build == hash   # returns true

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(values, keys) ⇒ HashBuilder

Returns a new instance of HashBuilder.

Parameters:

  • values (::Array) —

    List of values of the hash

  • keys (::Array) —

    List of keys of the hash



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# File 'lib/darthjee/core_ext/array/hash_builder.rb', line 33

def initialize(values, keys)
  @values = values.dup
  @keys = keys.dup
end

Instance Attribute Details

#keys ⇒ Object

keys of the hash to be built



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# File 'lib/darthjee/core_ext/array/hash_builder.rb', line 28

class HashBuilder
  attr_accessor :values, :keys

  # @param [::Array] values List of values of the hash
  # @param [::Array] keys List of keys of the hash
  def initialize(values, keys)
    @values = values.dup
    @keys = keys.dup
  end

  # Builds the hash
  # @return [::Hash] Hash whose keys and values are paired
  #   from builder's keys and values
  def build
    fixes_sizes

    ::Hash[[keys, values].transpose]
  end

  private

  def fixes_sizes
    return unless needs_resizing?
    values.concat ::Array.new(keys.size - values.size)
  end

  def needs_resizing?
    keys.size > values.size
  end
end

#values ⇒ Object

values of the hash to be built



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# File 'lib/darthjee/core_ext/array/hash_builder.rb', line 28

class HashBuilder
  attr_accessor :values, :keys

  # @param [::Array] values List of values of the hash
  # @param [::Array] keys List of keys of the hash
  def initialize(values, keys)
    @values = values.dup
    @keys = keys.dup
  end

  # Builds the hash
  # @return [::Hash] Hash whose keys and values are paired
  #   from builder's keys and values
  def build
    fixes_sizes

    ::Hash[[keys, values].transpose]
  end

  private

  def fixes_sizes
    return unless needs_resizing?
    values.concat ::Array.new(keys.size - values.size)
  end

  def needs_resizing?
    keys.size > values.size
  end
end

Instance Method Details

#build ⇒ ::Hash

Builds the hash

Returns:

  • (::Hash) —

    Hash whose keys and values are paired from builder’s keys and values



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# File 'lib/darthjee/core_ext/array/hash_builder.rb', line 41

def build
  fixes_sizes

  ::Hash[[keys, values].transpose]
end