What is the ENV.delete_if method in Ruby?
Overview
The delete_if{} method is used to delete an environment variable that returns “true” when passed to a given block.
Syntax
ENV.delete_if{|name,value|condition}
Parameters
name: This represents the name of each environment value.
value: This represents the value of the environment variable name.
condition: This takes the environment variable name or value and returns “true” or “false” depending on what condition was specified.
Return value
The value returned is ENV.
Example
# create some environment variablesENV["G"] = "Google"ENV["N"] = "Netflix"ENV["A"] = "Apple"ENV["A"] = "Amazon"ENV["M"] = "Meta"ENV["FOO"] = ""# delete some environment variables# based on a conditionENV.delete_if{|name, value| name.start_with?('A')}# delete variables that starts with "A"# print environment variablesputs ENV.values
Explanation
- Lines 2–7: We create environment variables.
- Line 11: We delete elements that start with the character
"A". - Line 15: We print the environment variable values and discover that the variables that start with the character
"A"were deleted.
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