Swift: Developing iOS Applications

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 to prevent it from being used when the equality operator (==) was meant to be used.

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 ...