In this tutorial, we will learn about if-else statements in Ruby. We will cover the basics of conditional execution using if-else statements.
An if-else statement is a conditional statement that executes one block of code if a specified condition is true, and another block of code if the condition is false.
The syntax for the if-else statement in Ruby is:
if condition
# Code block to execute if condition is true
else
# Code block to execute if condition is false
end
The if-else statement evaluates the specified condition. If the condition is true, the code block inside the if statement is executed; otherwise, the code block inside the else statement is executed.
We can use an if-else statement to check if a given number is an even number or odd number.
For example,
num
.num
.num
is even or odd.num
is even or odd.num = 10
if num % 2 == 0
puts "#{num} is even."
else
puts "#{num} is odd."
end
10 is even.
We can use an if-else statement to check if a given string starts with a specific prefix.
For example,
str
.str
.str
starts with a specific value.str = 'Hello, world!'
if str.start_with?('Hello')
puts 'String starts with 'Hello'.'
else
puts 'String does not start with 'Hello'.'
end
String starts with 'Hello'.
We can use an if-else statement to check if a given number is a positive number or a negative number.
For example,
num
.num
.num
is positive or negative.num
is positive or negative.num = -5
if num > 0
puts "#{num} is positive."
else
puts "#{num} is negative or zero."
end
-5 is negative or zero.