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we can do condional branching with either case expression or function pattern match. if you don't care about exception, you need to do nothing. let's quickly borrow a code from the hello world http server i explained in the previous article. we have to use the patter match for the conditional execution. here is the verbose code. the erlang has three class of exception: error, exit, and throw. after consdering the various code, i come up with this code.

so hopefully, the higher framework catch these exceptions and restart the process. whichever you use, it became quite verbose and boilar-plate. another type of error is although the query paramters are present, it has a string that cannot be parsed as an integer.

try expression can have of section and it will be evaluated only on pca poker 2019 exception in exprs. it's too verbose and ugly but i think alternatives are worse. well, it's not bad. my guess is to read more the backward compatibility.

the simplest code that assume no pca poker 2019 will be like this. but i feel some oddities on erlang's exception and that is the concept of class. walkthrough of hello world http server with erlang, cowboy, and rebar3 instead of returning the hello world, we're going to return the sum of two query parameter a, b.

but what if the caller want to deal with the error? erlang has exception like many other langauges. but i want to deal the the error. putting it all togather, it's very verbose to handle errors in erlang.

you can use try expression or catch expression try expression is strightforward, if you ignore the awkward erlang grammer that is. catch exprs catch expression evaluate exprs and return its pca poker 2019 on no exception. use try expression's of section to pattern match the error value.

suppose, the users forget the query parameters. well, at least, i understand the error handling of erlang.

it can be done by case expression or function. but if you care, that is, you want to run some code on the condition of exception, things get verbose. for exceptions of class throw, that is the code called throw term , term is returned. the catch expression.