In python I can do
_str = "My name is {}"
...
_str = _str.format("Name")
In ruby when I try
_str = "My name is #{name}"
The interpreter complains that the variable name is undefined, so it's expecting
_str = "My name is #{name}" => {name =: "Name"}
How can I have a string placeholder in ruby for later use?
You can use Delayed Interpolation.
str = "My name is %{name}"
# => "My name is %{name}"
puts str % {name: "Sam"}
# => "My name is Sam"
The %{} and % operators in Ruby allows delaying the string interpolation until later. The %{} defines named placeholders in the string and % binds a given input into the placeholders.
The interpreter is not expecting a hash, it's expecting a variable named name.
name = "Sam"
p str = "My name is #{name}" # => "My name is Sam"
The % method can be used as @rastasheep demonstrates. It can be used in a simpler way:
str = "My name is %s"
p str % "Name" # => "My name is Name"
Based on the previous answers, you can use %s in place of {} for simplicity and flexibility. Use array instead of string if you have multiple unnamed place holders.
_str = "%s is a %s %s"
...
_str % %w(That nice movie) # => "That is a nice movie"
