Logic - why isn't 'True' doing what I expect it to?

Asked Jul 05 '18 at 23:09

Active Jul 05 '18 at 23:41

Viewed 49 times

I have the following code

test[variable_: 0] := Module[{},
   If[variable != True, Print["worked"]];
   ];

test2[variable_: 0] := Module[{},
   If[variable == True, Print["worked"]];
   ];

If I run

test2[True]

I get "worked" as I expect.

But if I run

test[]

I return nothing. Why is this the case?

asked Jul 05 '18 at 23:09

Tomi

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31

6

== can't say anything about the equivalence between 0 and True. You want =!= and === instead. – C. E. Jul 05 '18 at 23:11
2

Or just use TrueQ – b3m2a1 Jul 05 '18 at 23:15
try to evaluate 0!=True and/or 0==True and see what happens – yosimitsu kodanuri Jul 06 '18 at 06:41

Logic - why isn't 'True' doing what I expect it to?

0 Answers0