Which

Which(cond1, expr1, cond2, expr2, ...)

yields expr1 if cond1 evaluates to True, expr2 if cond2 evaluates to True, etc.

Examples

>> n=5;
>> Which(n == 3, x, n == 5, y)
y

>> f(x_) := Which(x < 0, -x, x == 0, 0, x > 0, x)
>> f(-3)
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(x,b,True,c)

Which must be called with an even number of arguments:

>> Which(a, b, c)
Which(a, b, c)

Implementation status

• ✅ - full supported

Github

• Implementation of Which