Optional

Available

Represents a pattern with an optional default value.

Forms

patt : def or Optional[patt, def]

Verified examplesf[a] /. f[x_, Optional[y_, 2]] -> {x, y} → {a, 2}g[1] /. g[x_ : 0, y_ : 0] -> {x, y} → {1, 0}

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Topics

Patterns - Pattern Defaults
Syntax - Patterns
Variables And Functions - Function Argument Patterns »

Related

Default Alternatives PatternSequence Shortest BlankNullSequence StringExpression OptionalElement BlankSequence Blank Condition Pattern PatternTest

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