CODEWITHSUNDEEP
ruby
18bytes
18bytes

Reputation: 6029

Ruby way to do sum?

For me i could not think of better way but i believe there is one. Is there a ruby way (meaning: elegant way) to do the following method implementation?

def total(items)
  sum = 0
  items.each do |item|
    sum += item.value
  end
  sum
end

Upvotes: 0

Views: 100

Answers (4)

Andrew Marshall
Andrew Marshall

Reputation: 96934

map to get the values, then reduce them using addition:

def total(items)
  items.map(&:value).reduce(:+)
end

Upvotes: 3

megas
megas

Reputation: 21791

items.inject(0) { |memo,item| memo + item.value }

It may seem that no need to have 0 as initial value, but in case when array is empty it will return this initial value.

Second approach:

items.map(&:value).inject(0,:+)

Upvotes: 3

oldergod
oldergod

Reputation: 15010

def total(items)
  items.inject(0) do |total, item|
    total + item.value
  end
end

Upvotes: 1

Sergio Tulentsev
Sergio Tulentsev

Reputation: 230316

You can do this, for example

items.reduce{|sum, el| sum + el.value}

Upvotes: 2

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