July 2011
Intermediate to advanced
104 pages
2h 14m
English
Content preview from Perl Pocket Reference, 5th Edition
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Context
Perl expressions are always evaluated in a context that determines the outcome of the evaluation.
Boolean | A special form of scalar context in which it only matters if the result is true or false. Anything that is undefined or evaluates to an empty string, the number zero, or the string |
List | A list value is expected. Acceptable values are literal lists, arrays, and hashes. Slices of arrays, hashes, and lists are also acceptable. A scalar value will be interpreted as a one-argument list. |
Scalar | A single scalar value is expected. |
Void | No value is expected. If a value is provided, it is discarded. |
The following functions relate to context:
- scalar expr
Forces scalar context for the expression.
- wantarray
Returns true in list context, false in scalar context, and undef in void context.
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