websocket-util/node_modules/has-values/index.js

/*!
 * has-values <https://github.com/jonschlinkert/has-values>
 *
 * Copyright (c) 2014-2015, 2017, Jon Schlinkert.
 * Released under the MIT License.
 */

'use strict';

var typeOf = require('kind-of');
var isNumber = require('is-number');

module.exports = function hasValue(val) {
  // is-number checks for NaN and other edge cases
  if (isNumber(val)) {
    return true;
  }

  switch (typeOf(val)) {
    case 'null':
    case 'boolean':
    case 'function':
      return true;
    case 'string':
    case 'arguments':
      return val.length !== 0;
    case 'error':
      return val.message !== '';
    case 'array':
      var len = val.length;
      if (len === 0) {
        return false;
      }
      for (var i = 0; i < len; i++) {
        if (hasValue(val[i])) {
          return true;
        }
      }
      return false;
    case 'file':
    case 'map':
    case 'set':
      return val.size !== 0;
    case 'object':
      var keys = Object.keys(val);
      if (keys.length === 0) {
        return false;
      }
      for (var i = 0; i < keys.length; i++) {
        var key = keys[i];
        if (hasValue(val[key])) {
          return true;
        }
      }
      return false;
    default: {
      return false;
    }
  }
};