Use catcode for alternative way of writing fractions

Question

Writing fractions using different syntax would sometimes be useful, instead of using \frac{ab}{cd}, I would prefer to write something like \frac{ab⌂cd} where the Unicode ⌂ is the }{.

n.b., I don't want to mess with the \frac definition, but rather something like \newcommand{\myfrac}[2]{#1⌂#2}

Approach-My understanding of TeX is limited, but I think I can use catcode to do this, My understanding is that:

• \catcode `@=2 is equivalent to }
• \catcode `@=1 is equivalent to {

However just writing

\catcode`\⌂=\active
\def ⌂{ \catcode `@=2 \catcode `@=1 }

Answer 1

I have koi8-r locale & don't work with unicode, so instead of ⌂ I'll use |:

First define a command:

\makeatletter
\def\myfrac@#1|#2'{\frac{#1}{#2}}
\def\myfrac#1{\myfrac@#1'}
\makeatother

Then use it:

example: $\myfrac{10|20}$