CODEWITHSUNDEEP
rubyrounding
Jake Metz
Jake Metz

Reputation: 97

How do I display 2 decimals when there is a trailing 0 in a float

How can I display 2 decimal places (padding) on a float even if the trailing number is a 0. So, if I sum only the :cost values in the example below I would like it to return 23.00

items = [
    {customer: "John", item: "Soup", cost:("%.2f"% 8.50)}, 
    {customer: "Sarah", item: "Pasta", cost:("%.2f"% 12.00)}, 
    {customer: "John", item: "Coke", cost:("%.2f" % 2.50)}
]

PROBLEM: I have success displaying cost: values with two decimal places. However, the result returns a "string". I have tried ("%.2f" % 2.50).to_f with no such luck. I need a float so that I can complete the following inject code.

totalcost = items.inject(0) {|sum, hash| sum + hash[:cost]}

puts totalcost

When running this to sum the total cost I receive the following error because I cannot convert the string to a float successfully. String can't be coerced into Integer (TypeError)

Upvotes: 2

Views: 3054

Answers (2)

Ashik Salman
Ashik Salman

Reputation: 1879

You can calculate the sum of cost values after converting it to number(Integer/Float).

totalcost  = items.map { |x| x[:cost].to_f }.sum

The value of totalcost can be formatted with sprintf method in whatever way we want to display.

sprintf("%.2f", totalcost)

Hope it helps !

Upvotes: 4

Shani
Shani

Reputation: 2541

hash[:cost] is still returns a String. you could just cover it to a float before adding it to sum 

totalcost = items.inject(0) {|sum, hash| sum + hash[:cost].to_f}

Upvotes: 0

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