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What is the ENV.has_value?() method in Ruby?

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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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Overview

The has_value?() method in Ruby checks if a certain value of an environment variable exists. If such a value exists, this methods returns a true Boolean value. Otherwise, it returns a false value.

Syntax

ENV.has_value?("value")

Parameters

value: This is the value whose existence we want to check as an environment variable in our system.

Return value

This method returns a Boolean value. If the value exists, it returns true. Otherwise, it returns false.

Code example

# Creating some environment variables
ENV["G"] = "Google"
ENV["N"] = "Netflix"
ENV["A"] = "Apple"
ENV["A"] = "Amazon"
ENV["M"] = "Meta"
# Checking if the values exist
puts ENV.has_value?("Google") # true
puts ENV.has_value?("Facebook") # false
puts ENV.has_value?("Meta") # true
puts ENV.has_value?("Blockchain") # false
Checking if some values exists in our environment variables

Explanation

  • Lines 2–6: We create some environment variables.
  • Lines 9–12: We use the has_value?() method to check if some values exist. Then, we print the results to the console.

RELATED TAGS

ruby
env
value
javascript
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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