To format a named parameter in Ruby, you will have to use %<name> style instead of %{name} style (as the latter does not support formatting). You can then append the format specifier prefixed with a dot (.) to the named parameter to format it. For example:
puts "%<num>.d equals to %<num>.x in hexadecimal" % {num: 28}
# output: "28 equals to 1c in hexadecimal"
As you can see in the code above, the .d format specifies that the variable should be interpreted as a decimal number and .x format specifies that the variable should be interpreted as a hexadecimal number.
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