JSのオブジェクトのキーを62進数に置換⇔元に戻す

objectKeyTo62.js

/*
 // オブジェクトのキーを62進数に変換
 createKeydic(obj);
 keyShorten(obj);

 // オブジェクトのキーを62進数から元に戻す
 restoreKey(obj);
*/

var keydic = {};
var keydicrev = {};
var refKey = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
var keyid = 0;

function createKeydic(obj) {
  if (null === obj || typeof obj !== 'object') return;
  if (obj instanceof Array) {
    for (var i = obj.length; i--;) {
      createKeydic(obj[i]);
    }
  } else {
    for (var key in obj) {
      createKeydic(obj[key]);
      if (!keydic[key]) {
        keydic[key] = refKey[keyid];
        keydicrev[refKey[keyid]] = key;
        keyid++;
      }
    }
  }
}

function keyShorten(obj) {
  if (null === obj || typeof obj !== 'object') return;

  if (obj instanceof Array) {
    for (var i = obj.length; i--;) {
      keyShorten(obj[i]);
    }
  } else {
    for (var key in obj) {
      keyShorten(obj[key]);
      obj[keydic[key]] = obj[key];
      delete obj[key];
    }
  }
}

function restoreKey(obj) {
  if (null === obj || typeof obj !== 'object') return;

  if (obj instanceof Array) {
    for (var i = obj.length; i--;) {
      restoreKey(obj[i]);
    }
  } else {
    for (var key in obj) {
      restoreKey(obj[key]);
      obj[keydicrev[key]] = obj[key];
      delete obj[key];
    }
  }
}