mezzanine/es/virtual-stack.js

Fantasy land union types with pattern matching

export function applyStack(stack, data) {
  var ln = stack.length;
  if (ln === 0)
  return data;
  var history = [];
  var current = data;
  for (var i = 0; i < ln; ++i) {
    var fn = stack[i];
    var _val = fn(current);
    history.length = i + 1;
    current = history[i] = _val;
  }
  return current;
}

export function getInitialValue(stack, obj) {
  var val = obj;
  var succ = true;
  try {
    val = applyStack(stack, val);
  } catch (err) {
    succ = false;
    val = err.message;
  }
  return { val, succ };
}
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