In this tutorial, we will learn about if statements in Ruby. We will cover the basics of conditional execution using if statements.
An if statement is a conditional statement that executes a block of code if a specified condition is true.
The syntax for the if statement in Ruby is:
if condition
# Code block to execute if condition is true
end
The if statement evaluates the specified condition. If the condition is true, the code block inside the if statement is executed; otherwise, it is skipped.
The following is the flowchart of how execution flows from start to the end of an if statement.
We can use an if statement to check if a given number is an even number.
For example,
num
.num
.num
is even.num
is even or not.num = 10
if num % 2 == 0
puts "#{num} is even."
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".'
end
String starts with "Hello".
We can use an if statement to check if a given number is a positive number.
For example,
num
.num
.num
is positive.num
is positive or not.num = -5
if num > 0
puts "#{num} is positive."
end