stringifyJSON.js

// Same data for stringifyJSON
var myObj = {
  name: "Patrick",
  address: {
    street: {
      number: "559",
      streetName: "Lincoln Ave."
    },
    city: "Alameda",
    state: "CA",
    zip: "94501"
  },
  phone: "310-351-4050",
  hobbies: ["scuba", "poker", "comedy"],
  pets: ['Bixie', 'Coookie'],
  age: 57
}

// "{'name':'Patrick',address{'street'}
function stringifyJSON(obj) {
  var result = "{";
  function buildString(obj) {
    for (var key in obj) {
      if (Array.isArray(obj[key])) {
        result += "'" + key + "':" + "[";
        for (var i=0; i<obj[key].length; i++) {
          if (typeof obj[key][i] == 'object') {
            buildString(obj[key][i]);
          } else {
            result += "'" + obj[key][i] + "',";
          }
        } 
        result = result.slice(0,result.length-1) + "],";
      } else if (typeof obj[key] == 'object') {
        result += "'" + key + "':" + "{";
        buildString(obj[key]);
        result = result.slice(0,result.length-1) + "},";        
      } else {
        result += "'" + key + "':'" + obj[key] + "',";
      }
    }
  }
  buildString(obj);
  result = result.slice(0,result.length-1) + "}";
  return result;
}

// Sample data for parseJSON
var str = "{'name':'Patrick','address':{'street':{'number':'559','streetName':'Lincoln Ave.'},'city':'Alameda','state':'CA','zip':'94501'},'phone':'310-351-4050','hobbies':['scuba','poker','comedy'],'pets':['Bixie','Coookie'],'age':'57'}"

function parseJSON(str) {
  // Your code goes here
}

function getElementsByClassName(className) {
  var result = [];

  function getElements(node) {
    if (node.classList && node.classList.contains(className)) {
      result.push(node);
    }
    var childElements = node.children;
    for (var i = 0; i < childElements.length; i++) {
      getElements(childElements[i]);
    }
  }
  getElements(document.body);
  return result;
};