What is the function of the 'assert' keyword in the J programming language? -


what function of combining assert , -: in j? under circumstances apply assert in order proceed? thank much.

assert name defined verb 

assert=: 0 0 $ 13!:8^:((0 e. ])`(12"_))

which looks complicated testing 0 anywhere in vector using (0 e. ]) if there 0 (12"_) ,which way write verb returns 12 no matter argument, sent 13!:8 foreign conjunction signals errors. not surprisingly 12 signals assert error want having used assert. 0 0 $ in front assures after error interaction begins on next line.

the monadic form -: (half) not come play when used assert. dyadic -: (match) comes play way see if 2 things match each other , returns 1 if , 0 otherwise. means standard way of using assert , -: in form. 

assert (expected result) -: (computed result)

if computed result matches expected result there no assert error, if not assert error raised. using numerous assert tests allows test driven development environment.


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