• ← Switch
• → Which

Throw

WMA link

Throw[`value`]

stops evaluation and returns `value` as the value of the nearest enclosing Catch.

Catch[`value`, `tag`]

is caught only by `Catch[expr,form]`, where tag matches form.

Using Throw can affect the structure of what is returned by a function:

• • NestList[#^2 + 1 &, 1, 7]

• • Catch[NestList[If[# > 1000, Throw[#], #^2 + 1] &, 1, 7]]

• • Throw[1]