var demoMemory = [];

​

function stringToArray(str) {

  var i,

      length = str.length,

      arr = [];

  for(i=0; i<length; i+=4) {

    arr.push(

      (((str.charCodeAt(i)   || 0) << 24)

      |((str.charCodeAt(i+1) || 0) << 16)

      |((str.charCodeAt(i+2) || 0) << 8)

      |((str.charCodeAt(i+3) || 0)))

    );

  }

  if(length % 4 === 0) {

    arr.push(0);

  }

  return arr;

}

​

function arrayToString(arr) {

  var i, j, chrCode,

      length = arr.length,

      str = [];

  label:

  for(i=0; i<length; i++) {

    for(j=24; j>=0; j-=8) {

      chrCode = (arr[i] >> j) & 0xFF;

      if(chrCode) {

        str.push(String.fromCharCode(chrCode));

      } else {

        break label;

      }

    }

  }

  return str.join('');

}

​

console.log(demoMemory = stringToArray('Hello, World!')); // => [1214606444, 1865162839, 1869769828, 553648128]

console.log(arrayToString(demoMemory)); // "Hello, World!"

​

​