Synopsis Group statements into a block.
Syntax
{ Statement1; ... ; Statementn }
Description A block consists of a sequence of statements separated by semi-colons.
Since a block is itself a statement, it may be used in all places where a statement is required. A block also introduces a new scope and variables that are declared in the block are local to that block. The value produced by a block is the value produced by its last statement (if any).
Since a block is itself a statement, it may be used in all places where a statement is required. A block also introduces a new scope and variables that are declared in the block are local to that block. The value produced by a block is the value produced by its last statement (if any).
Examples Here is a contrived block of three expressions (be aware of the last semi-colon):
The effect of a local variable declared in a block can be seen as follows:
rascal>{1;2;3;}
int: 3
its value is 3.
The effect of a local variable declared in a block can be seen as follows:
rascal>{int x = 3; x*x;}
int: 9
After the block we cannot refer to x:
rascal>x;
|stdin:///|(0,1,<1,0>,<1,1>): Undeclared variable: x