operators.md

Operators

Relational Operators

Equality comparisons can be used on all Ruby objects, including Strings, Integers, Floats, Arrays, Hashes, etc:

• == (equal to?)
• != (not equal to?)

Note the difference between = and ==

Numeric comparisons are used primarily on Integers and Floats:

• > (greater than?)
• < (less than?)
• >= (greater than or equal to?)
• <= (less than or equal to?)

The "result" of any of these relational operator is a boolean. Recall that there are two kinds of boolean objects:

• true
• false

# Is one greater than zero?
1 > 0
# => true

# Is the string 'hello' equal to the string 'hello'?
"hello" == "hello"
# => true

Logical Operators

Logical Operators are used to test two or more relationships together. There are three main logical oeprators that we would use:

• && (and) Outcome of p && q is true only if both p and q are true

• || (or) Outcome of p || q is true if either p or q is true

• ! (not) Outcome of !p is true if p is false. Outcome of !p is false if p is true.

Truth Table