FirstCase
WMA link
- FirstCase[{$e_1$, $e_2$, ...}, pattern]
- gives the first ei to match pattern, or $Missing[“NotFound”]$ if none matching pattern is found.
- FirstCase[{$e_1$,$e_2$, ...}, pattern -> rhs]
- gives the value of rhs corresponding to the first ei to match pattern.
- FirstCase[expr, pattern, default]
- gives default if no element matching pattern is found.
- FirstCase[expr, pattern, default, levelspec]
- finds only objects that appear on levels specified by levelspec.
- FirstCase[pattern]
- represents an operator form of FirstCase that can be applied to an expression.