Rails: Is there a rails trick to adding commas to large numbers?

Question

Is there a way to have rails print out a number with commas in it?

For example, if I have a number 54000000.34, I can run <%= number.function %>, which would prin

Answer 1

for javascript folks

function numberWithDelimiter(value) {
    return (value+"").split("").reverse().join("").replace(/(\d{3})(?=\d)/g, '$1,').split("").reverse().join("")
}

:)

Answer 2

For anyone not using rails:

number.to_s.reverse.gsub(/(\d{3})(?=\d)/, '\\1,').reverse

Answer 3

If you want to add commas outside of views and you don't want to include some modules, you can use number_to_delimited method (rails version >= 4.02). For example:

#inside anywhere
ActiveSupport::NumberHelper.number_to_delimited(1000000) # => "1,000,000"

Answer 4

  def add_commas(numstring)
    correct_idxs = (1..100).to_a.select{|n| n % 6 == 0}.map{|n| n - 1}
     numstring.reverse.chars.join(",").chars.select.with_index{|x, i| i.even? || correct_idxs.include?(i)}.join.reverse
  end

This was my way in ruby

Addition edit: Basically it adds all commas in between the numbers and only selects the ones where the index + 1 % 6

I figured the commas up to 100 was fine but if you want a super long number just make 100 a higher number

Answer 5

new syntax

number_with_delimeter(@number, delimeter: ",")

If you you want to user delimeter for money then you can do

number_to_currency(@number)

this will add $ too. If you are using money gem then you can do

Money.new(@number,"USD").format

This will also put $.

number_with_delimiter

ruby money

number_to_currency

Answer 6

You can use methods from ActiveSupport

For example:

ActiveSupport::NumberHelper::number_to_currency(10000.1234,{precision: 2,unit: ''})