CODEWITHSUNDEEP
syntax-errorocaml
Tosh
Tosh

Reputation: 130

ocaml syntax error in REPL mode

This part of my code always shows me some syntx error: operator expected in the ocaml REPL. The error is on the let of the line "let rec projected ...". What might it be? conditions is defined as a string list and aTable is (string list * string list* (string list) list) 

 let project (conditions, aTable)=(
    let trueFalseList = match aTable with 
        _,cols,_ -> dataMatcher(cols, conditions)

    let rec projected (aTable, trueFalseList) = match aTable with
        name,[],[] -> name,[],[]
      |name,cols,[] -> newLineMaker ((List.hd cols), trueFalseList)::projected(name,(List.tl cols),[])
      |name,cols,vals -> newLineMaker ((List.hd vals), trueFalseList)::projected(name,cols,(List.tl vals)) 
  )

Upvotes: 1

Views: 83

Answers (1)

Jeffrey Scofield
Jeffrey Scofield

Reputation: 66818

The lines typed into an OCaml REPL in essence form an OCaml module. At the outermost level of a module you can have

let name = value

to define a global named value of the module.

In your case, you have let project (conditions, aTable) = value. In other words, you're defining a function project that takes a pair of values as its parameter.

In any places other than the outermost level of a module, there are no global names. So every let must be followed by in. This is the case in the definition of your project function, and is what the interpreter is complaining about. It is expecting to see in, or a continuation of the expression (i.e., an operator of some sort).

It's not clear what your function project is supposed to return. What is the type of project as a whole?

Upvotes: 2

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