What is the replace() method of the ENV class in Ruby?
Overview
The replace() method replaces all the environment variables present. It is similar to the clear method. It replaces all variables with new environment variables that it takes as a Hash. This Hash is the parameter that it takes.
Syntax
ENV.replace(hash)
Syntax for the replace() method in Ruby
Parameters
hash: This is a hash that is passed to the replace() method. The name/value pairs of this hash replace all the environment variables present.
Return value
The value returned is the ENV.
Code example
# print current environment variablesputs "PREVIOUS ENVIRONMENT VARIABLES: \n"ENV.each_pair{|name, value| puts "#{name} = #{value}"}# replace all environment variables with replace()ENV.replace("c" => "cat", "token" => "123", "secret" => "323dsdf")# reprint all environment variablesputs "\nCURRENT ENVIRONMENT VARIABLES: \n"ENV.each_pair{|name, value| puts "#{name} = #{value}"}
Explanation
- Line 3: We use the
each_pair{}method and print the current environment variables. - Line 6: We use the
replace()method and replace all environment variables present with new ones. - Line 10: We reprint the same environment variables as the ones in line 3.
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