See how optional parameters and currying could work

[WaldoJeffers]

Currently, as curry checks the number of passed parameters against the function's length property, curried functions can not have optional parameters, which can be frustrating at times.

Ideas

• use curryN to define the minimum number of required parameters to make the function work. Execute the function as soon as that number has been reached
• parse the toString() representation of the function to see how many optional parameters there are

Warning

• additional parameters should only be the last parameters of a function
• make sure additional parameters are not removed when using the non-curried version

const add = (a, b, c = 3)
curry(add)(1, 2) // should be 6
curry(add)(1, 2, 4) // should be 7

[WaldoJeffers]

Interestingly, parameters with default values are not included in the count returned by fn.length