Render an ERB template with values from a hash

Question

require 'erb'
require 'ostruct'

def render(template, vars)
  ERB.new(template).result(OpenStruct.new(vars).instance_eval { binding })
end

e.g

render("Hey, <%= first_name %> <%= last_name %>", first_name: "James", last_name: "Moriarty")
# => "Hey, James Moriarty"

Update:

A simple example without ERB:

def render(template, vars)
  eval template, OpenStruct.new(vars).instance_eval { binding }
end

e.g.

render '"Hey, #{first_name} #{last_name}"', first_name: "James", last_name: "Moriarty"
# => "Hey, James Moriarty

Update 2: checkout @adam-spiers comment below.