@coorpacademy/progression-engine/es/rule-engine/apply-instructions.js

import _update from "lodash/fp/update";
import _set from "lodash/fp/set";
import _reduce from "lodash/fp/reduce";
const apply = (variables, instruction) => {
  const {
    type,
    value,
    field
  } = instruction;
  switch (type) {
    case 'set':
      return _set(field, value, variables);
    case 'add':
      return _update(field, v => {
        if (typeof v === typeof value && (typeof v === 'number' || typeof v === 'string') && (typeof value === 'number' || typeof value === 'string')) return v + value;
        return v;
      }, variables);
    default:
      return variables;
  }
};
const updateVariables = instructions => fromState => {
  const {
    lives,
    stars,
    ...variables
  } = _reduce(apply, {
    lives: fromState.lives,
    stars: fromState.stars,
    ...fromState.variables
  }, instructions);
  return {
    ...fromState,
    lives,
    stars,
    variables
  };
};
export default updateVariables;
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