sharedb/lib/util.js

JSON OT database backend

exports.doNothing = doNothing;
function doNothing() {}

exports.hasKeys = function(object) {
  for (var key in object) return true;
  return false;
};

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger#Polyfill
exports.isInteger = Number.isInteger || function(value) {
  return typeof value === 'number' &&
    isFinite(value) &&
    Math.floor(value) === value;
};

exports.isValidVersion = function(version) {
  if (version === null) return true;
  return exports.isInteger(version) && version >= 0;
};

exports.isValidTimestamp = function(timestamp) {
  return exports.isValidVersion(timestamp);
};