Operators

Dart defines the operators shown in the following table.You can override many of these operators, as described inOverridable operators.

DescriptionOperator
unary postfixexpr++ expr— () [] . ?.
unary prefix-expr !expr ~expr ++expr —expr await expr
multiplicative / % ~/
additive+ -
shift<< >> >>>
bitwise AND&
bitwise XOR^
bitwise OR|
relational and type test>= > <= < as is is!
equality== !=
logical AND&&
logical OR||
if null??
conditionalexpr1 ? expr2 : expr3
cascade..
assignment= = /= += -= &= ^= etc.

Warning: Operator precedence is an approximation of the behavior of a Dart parser. For definitive answers, consult the grammar in the Dart language specification.

When you use operators, you create expressions. Here are some examplesof operator expressions:

  1. a++
  2. a + b
  3. a = b
  4. a == b
  5. c ? a : b
  6. a is T

In the operator table,each operator has higher precedence than the operators in the rowsthat follow it. For example, the multiplicative operator % has higherprecedence than (and thus executes before) the equality operator ==,which has higher precedence than the logical AND operator &&. Thatprecedence means that the following two lines of code execute the sameway:

  1. // Parentheses improve readability.
  2. if ((n % i == 0) && (d % i == 0)) ...
  4. // Harder to read, but equivalent.
  5. if (n % i == 0 && d % i == 0) ...

Warning: For operators that work on two operands, the leftmost operand determines which version of the operator is used. For example, if you have a Vector object and a Point object, aVector + aPoint uses the Vector version of +.