if statement - Erlang equivalent to if else -

i have 2 parts of code want execute. both conditionals

if value1 < n   else if value1 >= n  if value2 < n   else if value2 >= n 

i want @ 1 statement of each execute.

how if work in erlang? there no else. use multiple guards, looks have 4 if statements. in groups of 2.

if condition    code;  if other condition   code  end. 

i syntax error.

the form if is:

if     <guard 1> -> <body1> ;     <guard 2> -> <body2> ;     ... end 

it works trying guards in if-clauses in top-down order (this defined) until reaches test succeeds, body of clause evaluated , if expression returns value of last expression in body. else bit in other languages baked it. if none of guards succeeds if_clause error generated. common catch-all guard true succeeds, catch-all can true.

the form case is:

case <expr> of     <pat 1> -> <body1> ;     <pat 2> -> <body2> ;     ... end 

it works first evaluating , trying match value patterns in case-clauses in op-down order (this defined) until 1 matches, body of clause evaluated , case expression returns value last expression in body. if no pattern matches case_clause error generated.

note if , case both expressions (everything expression) both must return values. 1 reason why there no default value if nothing succeeds/matches. force cover options; important case. if degenerate case of case inherited it. there bit of history of if in erlang rationale can find on trapexit.org under user contributions.