The Which command evaluates a specified test and returns its value corresponding to the first on the yields TRUE.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

h:= proc (x) options operator, arrow; Which(x < -2, x/3, x > 3, x^2, true, 0) end proc;

$h≔x\mapsto \mathrm{MmaTranslator}:-\mathrm{Mma}:-\mathrm{Which}\left(x<\mathrm{-2}\&comma;\frac{x}{3}\&comma;3<x\&comma;x^2\&comma;\mathrm{true}\&comma;0\right)$

$h\left(6\right)$

$36$

$h\left(2\right)$

$0$

$\mathrm{with}\left(\mathrm{MmaTranslator}\right)\&colon;$

$\mathrm{FromMma}\left(\mathrm{`h[x\_]:=Which[x\; <\; -2,\; x/3,\; x\; >\; 3,\; x^2,\; True,\; 0]`}\&comma;\mathrm{evaluate}\right)$

$x\mapsto \mathrm{Which}\left(x<\mathrm{-2}\&comma;\frac{x}{3}\&comma;3<x\&comma;x^2\&comma;\mathrm{true}\&comma;0\right)$

$h\left(-5\right)$

$-\frac{5}{3}$