curry.js

// Pure message maker
var messageMakerCurried = R.curry(function(parens, concat, singleMsg = {}) {
  var {name, message, date} = singleMsg;
  var nameTag = concat(name, ': ');
  var dateTag =  parens(date);
  return concat(
    concat(nameTag, message),
    concat(' ', dateTag)
  );
});

function concatDef(src = '', tgt = ''){
  return src + tgt;
}
var wrap = (left, body, right) => concat(concat(left, body), right);
var parensDef = (b) => wrap('(', b, ')');

var messageMaker = messageMakerCurried(parensDef, concatDef);

// Now messageMaker only needs singleMsg