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uc
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine uc 

sub uc(Str(Cool))
method uc()

Coerces the invocant (or in sub form, its argument) to Str, and returns it case-folded to uppercase (capital letters).

say "Abc".uc;       # OUTPUT: «ABC␤»

In Str§

See primary documentation in context for routine uc 

multi        uc(Str:D  --> Str:D)
multi method uc(Str:D: --> Str:D)

Returns an uppercase version of the string.

In Allomorph§

See primary documentation in context for method uc 

method uc(Allomorph:D:)

Calls Str.uc on the invocant's Str value.