Note: information on this page refers to Ceylon 1.0, not to the current release.

else operator

The left-associative, binary else operator is used to provide a default value when it's left operand is null.


void m(String? s) {
    String s2 = s else "";


The else operator is defined as follows

if (exists lhs) then lhs else rhs

See the language specification for more details.

The then operator is often used with the else operator to emulate C's ternary operator cond ? when-true-expr : when-false-expr, like so

T|F result = cond then whenTrueExpr else whenFalseExpr;


The result type of the else operator is given by the type expression Lhs&Object|Rhs, wher Lhs is the type of the left hand operand and Rhs is the type of the left hand operand.

See also