Operators

An operator is a symbol or combination of symbols that we can use to check, change, or combine values. We have used operators in most of the examples so far in this book; however, we did not specifically call them operators. In this section, we will show how to use most of the basic operators that Swift supports.

Swift supports most standard C operators and also improves them to eliminate several common coding errors. For example, the assignment operator does not return a value, which prevents it from being used where we meant to use the equality operator (==).

Let's look at the operators in Swift.

The assignment operator

The assignment operator initializes or updates a variable.

Prototype:

varA = varB 

Example:

let x = 1 
var y = "Hello" 
a = b 

Comparison operators

The comparison operator returns the true Boolean if the statement is true or the Boolean false if the statement is not true.

Prototypes:

Equality:  varA == varB 
Not equal:  varA != varB 
Greater than:  varA...