7 lines
187 B
TeX
7 lines
187 B
TeX
\def\prepend#1#2{% #1=string #2=macro containing a string
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\edef#2{\unexpanded{#1}\unexpanded\expandafter{#2}}%
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}
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\def\mystring{world!}
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\prepend{Hello }\mystring
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Result : \mystring
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\bye
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