Re: [Haskell-cafe] Why cannot i add the `let` declaration ?

30 Jan 2010

      zaxis  writes:
...
find_the_day sDay 0 = sDay
find_the_day sDay nDay = 
    let nextDay = addDays 1 sDay
    if (is_trade_day $ nextDay)
    then find_the_day nextDay (nDay - 1)
    else find_the_day nextDay nDay
The correct syntax is let ... in ...; you've forgotten the "in", so
something like this:

,----
| find_the_day sDay 0 = sDay
| find_the_day sDay nDay = 
|     let nextDay = addDays 1 sDay
|     in if (is_trade_day $ nextDay)
|        then find_the_day nextDay (nDay - 1)
|        else find_the_day nextDay nDay
`----

Note that in do-blocks you don't need the `in'; in "normal" code you do.

-- 
Ivan Lazar Miljenovic
Ivan.Miljenovic@gmail.com
IvanMiljenovic.wordpress.com