Swift Statements

Swift Statements

Swift code is built from statements such as declarations, expressions, and control flow (if, switch, loops).

Expression & Declaration Statements

Declarations introduce names (like variables and constants).

Expression statements evaluate an expression, such as a function call.

let x = 2  // declaration
print(x)    // expression statement

This example shows a constant declaration and an expression statement that prints its value.

Semicolons and Blocks

Semicolons are optional at line ends; use them only to separate multiple statements on one line.

Braces group statements into a block.

let a = 1; let b = 2 // semicolons can separate multiple statements on one line
print(a + b)

if a < b {
  print("a is less than b")
}

Swift does not require semicolons at the end of each line.

Use them only when writing more than one statement on the same line.

Braces { ... } form blocks that group statements.