Blocks and lexical scoping
A block is an expression that encapsulates one or more statements or
expressions, and is enclosed by
The last statement in a block must be an expression.
A block is itself an expression, and has the type and result of the last expression of the block:
A block defines variable scope. Variables declared in a block are scoped to the block and can’t be referenced outside of the block.
In the example, two
x variables are declared. One with local scope and
one with global scope. Variable
y has global scope and is the value
of the block.
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