Throw

Usage

• Throw[value] stops evaluation and returns value as the value of the nearest enclosing Catch.
• Throw[value, tag] is caught only by Catch[expr, form] where form is a pattern that matches tag.

Notes

• You can use Throw and Catch to exit functions such as Nest, Fold, FixedPoint and Scan.

• tag can be any expression.

• tag in Throw[value, tag] is re-evaluated every time it is compared to form in Catch[expr, form].

• An error is generated and an unevaluated Throw is returned if there is no appropriate enclosing Catch to catch the Throw.

• See Section 2.6.9.

• See also: Return, Goto, Interrupt, Abort, Sow.

• New in Version 1; modified in 3.

Further Examples