Class: Palantir::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/palantir/base.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, default = 0) ⇒ Base

Create a Palantir.

Example:

>> p = Palantir::Base.new([{key: 'key', value: 'value'}])
=> #<Palantir::Base:0x007fe1de9642f0 @data=[{:foo=>"bar"}], @default=0>

Arguments:

data: (Array)
default: (Integer)



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# File 'lib/palantir/base.rb', line 15

def initialize(data, default = 0)
  @data = data
  @default = default
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/palantir/base.rb', line 4

def data
  @data
end

#default ⇒ Object

Returns the value of attribute default.



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# File 'lib/palantir/base.rb', line 4

def default
  @default
end

Instance Method Details

#size ⇒ Object

Return the @data size in the Palantir instance.



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# File 'lib/palantir/base.rb', line 22

def size
  @data.count
end

#sum(key, first_value = 0) ⇒ Object

Sum data of a specific key, if any, otherwise add the default_value. This ends a chain of ‘where’.

Example:

>> palantir.where(:class, 'wizard').sum(:age)

Arguments:

key: (Symbol)
first_value: (Integer)



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# File 'lib/palantir/base.rb', line 52

def sum(key, first_value = 0)
  @data.reduce(first_value) do |sum, element|
    sum += element.fetch(key){ @default }
  end
end

#where(key, value) ⇒ Object

Filter data with a where clause given a pair <key, value>. Chainable

Example:

>> palantir.where(:class, 'wizard').where(:name, 'Gandalf')

Arguments:

key: (Symbol)
value: (String, Integer, Decimal...)



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# File 'lib/palantir/base.rb', line 35

def where(key, value)
  filtered_data = @data.select do |element|
    element.has_key?(key) && element.fetch(key) == value
  end
  self.class.new(filtered_data, @default)
end