• ← Throw
• → While

Which

WMA link

Which[$cond_1$, $expr_1$, $cond_2$, $expr_2$, ...]

yields $expr_1$ if $cond_1$ evaluates to True, $expr_2$ if $cond_2$ evaluates to True, etc.

• • n = 5;

• • Which[n == 3, x, n == 5, y]

• • f[x_] := Which[x < 0, -x, x == 0, 0, x > 0, x]

• • f[-3]

If no test yields True, Which returns Null:

• • Which[False, a]

If a test does not evaluate to True or False, evaluation stops
and a Which expression containing the remaining cases is
returned:

• • Which[False, a, x, b, True, c]

Which must be called with an even number of arguments:

• • Which[a, b, c]