Expressions

This is a quick overview of expressions in Kotlin.

Atomic expressions

Atomic expressions are

• Literal constants (see Basic types, Strings)
• Tuple literals
• Variable names or field references
• Object expressions
• Parenthesized expression
• Control structures (if, when, try)
• Function literals
• this expressions
• break, continue or return
  • note that these are expressions that are typed with the type Nothing

See the grammar for atomic expressions.

Operators

The grammar defines a number of operators denoted by symbols. The precedence table is available here. Many of the operators can be overloaded, other are described below:

• . – for member access
• ?. and ?: – for Null-safety
• && and || – for incomplete boolean evaluation

What's next

• Basic operations
• Control structures
• Function literals
• Returns and jumps
• Ranges
• This expressions
• Tuples
• Type casts