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The most commonly used **conditional statement** in Ruby is the `if` statement. It contains a conditional expression and a true branch, and it may contain a false branch. The true branch is executed when the conditional expression is true. The false branch, if present, is executed when the conditional expression is false. The following program demonstrates the use of the conditional statement.



We want to write a program that determines eligibility for a driver’s license based on the `age` input by the user. The eligible age should be $18$ or above. 

print("Enter your age: ")
age = Integer(gets) # Taking age input
if age >= 18 # If age is greater than and equal to 18
    print("You are eligible for a driver's license.\n")
else
    print("You are not eligible for a driver's license.\n")
end

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


ruby

React

Dart

GoJS React

Typescript React

Vue.js

The conditional statement used in the program above starts with `if`, followed by a conditional expression. **Line 4** contains the code to be executed if the condition is true. Note the **indentation** (extra space) at the start of **line 4**. The word `else` on **line 5** indicates the end of the true branch and the start of the false branch. **Line 6** is the code that will be executed if the condition is false. Note the indentation (extra space) at the start of **line 6**.


# Example program
The following example program demonstrates the use of the `if` statement in a Ruby program.

## Sum of the digits
We want to write a program that takes an input number and displays the sum of its digits. We assume that the user will enter a positive number up to four digits.



Learn about the conditional statement in Ruby.

Ruby Basics

Loops in Ruby

Ruby Strings and Arrays

Ruby Methods

Wrap Up