September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Handling Errors in Sequential Code
Every time we call a function in Erlang, one of two things will
happen: either the function returns a value or something goes
wrong. We saw examples of this in the previous chapter. Remember
the cost function?
| shop.erl | |
| | cost(oranges) -> 5; |
| | cost(newspaper) -> 8; |
| | cost(apples) -> 2; |
| | cost(pears) -> 9; |
| | cost(milk) -> 7. |
This is what happened when we ran it:
| | 1> shop:cost(apples). |
| | 2 |
| | 2> shop:cost(socks). |
| | ** exception error: no function clause matching |
| | shop:cost(socks) (shop.erl, line 5) |
When we called cost(socks), the function crashed. This
happened because none of the clauses that define the function
matched the calling arguments.
Calling cost(socks) is pure nonsense. There is no sensible value that the ...
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