f# - if requires an else clause -


i have following code in function, , eliminate duplication of dosomethingelse():

fun ->     if = b         let c = expensiveoperation()         if c = d             result         else             dosomethingelse()     else         dosomethingelse()

i think should able eliminate both else clauses. , let return either result or dosomethingelse(). when that, error message compiler is: "this expression expected have type unit here has type int "

why if expression require else clause?

this equivalent wrote, wonder if mean else.

if = b && expensiveoperation() = d result else dosomethingelse()

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