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chr
Combined from primary sources listed below.

In Int§

See primary documentation in context for routine chr 

multi        chr(Int:D  --> Str:D)
multi method chr(Int:D: --> Str:D)

Returns a one-character string, by interpreting the integer as a Unicode codepoint number and converting it to the corresponding character.

Example:

65.chr;  # returns "A"
196.chr; # returns "Ä"

In Cool§

See primary documentation in context for routine chr 

sub chr(Int(Cool))
method chr()

Coerces the invocant (or in sub form, its argument) to Int, interprets it as a Unicode code points, and returns a Str made of that code point.

say '65'.chr;       # OUTPUT: «A␤»

The inverse operation is ord.

Mnemonic: turns an integer into a character.