True if s is nil, empty, or contains only whitespace.

Return a new string, using cmap to escape each character ch

from s as follows:

If (cmap ch) is nil, append ch to the new string. If (cmap ch) is non-nil, append (str (cmap ch)) instead.

String interpolation.

Join the elements of the collection using an optional separator

Replace all occurrences of x in s with r.

Replace the first occurrence of x in s with r.

Returns s with its characters reversed.

Splits on n or rn, the two typical line breaks.

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