Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS

Posted by Miguel Leon
Miguel Leon
1,720 Points

What is a Boolean ?

I already finished swift basics but i still can't quite understand the function of a boolean.

David Richardson
David Richardson
10,213 Points
David Richardson
David Richardson
10,213 Points

Boolean is a data type that only has 2 possible values, either true or false (1 or 0)

2 Answers

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

The concept of a bool is pretty simple, think of it as a condition that is true or false.

For example. 

/*
 Are you human ? There are two posible answers to the question ( true or false ) 
 therefore this can be consider a boolean. Lets see it in code.  
*/

var human = true 

if human == true {
println("Yes this is true")
} else {
println("No this is false")
}
// This will print “Yes this is true” because the variable human
// was declared with the value "true"

/*

You can read that as If human is true, then print “Yes this is true”, if it’s false, print “No this is false” So the condition of something being true or false is a boolean. It only has those two answers.

Hope you understand.

Austin Liu
Austin Liu
3,326 Points
Austin Liu
Austin Liu
3,326 Points

A boolean is a value that either responds in 'true' or 'false', or in simpler terms, 'yes' or 'no'. Booleans can be used in asking if, suppose if a user is connected to the internet, or if they like cheese, or something along those lines. Hope this helped!