The print() Function

Basic Printing

The simplest use of print takes a single string and writes it to the console, automatically adding a newline character at the end so the next print call starts on a fresh line.

Example: Basic Printing

print("First line")
print("Second line")

String Interpolation

Swift lets you embed variables and expressions directly inside a string using \(expression), which is far cleaner than concatenating strings with +.

Note: You can put any expression inside the parentheses, not just a variable, e.g. \(2 + 2).

Example: String Interpolation

let name = "Swift"
let version = 5.9
print("Learning \(name) version \(version)")

Multiple Arguments and separator

print accepts multiple comma-separated values and joins them with a space by default. The separator parameter customizes what appears between them.

Example: Multiple Arguments and separator

print("apple", "banana", "cherry")
print("apple", "banana", "cherry", separator: " - ")

Custom terminator

By default print ends with a newline, but the terminator parameter can replace that with something else, such as an empty string to keep printing on the same line.

Note: Using terminator: "" is handy for building up a single line of output across multiple print calls.

Example: Custom terminator

print("Loading", terminator: "")
print("...", terminator: "")
print("done")