Utils functions from my projects

utils.js

'use strict';

var _ = require('underscore');

exports.randomString = function (length) {
  var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghiklmnopqrstuvwxyz';
  length = length ? length : 32;
  var string = '';
  for (var i = 0; i < length; i++) {
    var randomNumber = Math.floor(Math.random() * chars.length);
    string += chars.substring(randomNumber, randomNumber + 1);
  }
  return string;
};

/**
 *
 * @param from
 * @param to
 * @returns {Number} number between 0-1
 */
exports.normallyRandom = function (from, to) {
  var r = (Math.random() + Math.random() + Math.random() + Math.random() + Math.random() + Math.random()) / 6;
  return from + (to - from) * r;
};

exports.redisScan = function (client, type, params, cb) {
  var args = [params.key, params.cursor];
  if (_.isNumber(params.count)) {
    args.push('count');
    args.push(params.count);
  }
  if (params.match) {
    args.push('match');
    args.push(params.match);
  }
  args.push(function (err, rst) {
    if (err) return cb(err);
    var cursor = rst[0];
    var arr = rst[1];
    var data = {};
    _.times(arr.length / 2, function (i) {
      data[arr[i * 2]] = arr[i * 2 + 1];
    });
    cb(null, {cursor: cursor, data: data});
  });
  client[type].apply(client, args);
};