Switch

Switch[expr, form₁, value₁, form₂, value₂, ...]
evaluates expr, then compares it with each of the form_i in turn, evaluating and returning the value_i corresponding to the first match found.

MORE INFORMATION

Only the value_i corresponding to the first form_i that matches expr is evaluated. Each form_i is evaluated only when the match is tried.

If the last form_i is the pattern _, then the corresponding value_i is always returned if this case is reached.

If none of the form_i match expr, the Switch is returned unevaluated.

Switch has attribute HoldRest.

You can use Break, Return and Throw in Switch.

EXAMPLES

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Basic Examples (2)

Process Boolean value to 1 or 0, giving a message and defaulting to 0 when not Boolean:

Give a suggested symbolic transformation for an expression:

In[1]:=

In[2]:=

Out[2]=

Try the transformation:

In[3]:=

Out[3]=