The Ultimate JavaScript CheatSheet

The Ultimate JavaScript CheatSheet



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Hello everybody, and welcome to intelligent hackers website This is the first tutorial of the Series “Step-by-Step Hacking Guide” from intelligent hacker

Firstly, we are going to build some programming base for our Aspirant Hackers. The most important skills for any Hacker is the programming skills he/she possesses. You are going to need a lot of programming in your Hacking Career for developing your own tools or finding some vulnerability in the code of any website or software.
Today, we are going to continue our JavaScript tutorials series. As a Hacker, I cannot forget the impact of JavaScript as a Skill for Hackers. Its a must especially for those who want to learn Web Hacking. And remember that “2016 is Javascript” no matter if you are a programmer or Hacker.
Javascript is rapidly moving towards Server Side Scripting, and it will soon become a major Client Side and Server Side Technology for Web Development. That’s another good reason to learn Javascript right now.
Recently, we posted a tutorial on learning the Javascript programming language just in one video. I hope you guys found it helpful. Here is the link to that post:

• Learn Javascript in one Video.
  

But then I realized that I should also post a CheatSheet for JavaScript. It will help you to brush up your JavaScript concept every time you feel like getting frustrated in JavaScript. So, here it is. But, before diving into the code, make sure to watch that video along with this code.

The Ultimate Javascript CheatSheet:-

Here is the Ultimate Javascript CheatSheet :-
The Ultimate JavaScript CheatSheet

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// You create variables that store values with var   // Prompt opens a popup that requests info   var yourName = prompt(“What is your name?”);   // If performs different actions depending on conditions   if(yourName != null){     // Set text in an HTML element with the id sayHello     // You concatenate (combine) strings with +     document.getElementById(“sayHello”).innerHTML = “Hello “ + yourName;   } else {     // Alert opens a popup that contains a message     alert(“Please Enter Your Name Next Time”);   } // ———- VARIABLES ———- // variable names can’t start with a number, contain spaces, but can // contain letters, numbers, underscores or $ (Are case sensitive) var myName = “Webster”; var myAge = 19; // Variables don’t have a defined type, which can cause problems myName = 100; // ———- MATH ———- // document.write outputs data to the browser document.write(“5 + 4 = “, 5 + 4, “ ”); // Using + instead of , will treat everything as a string unless you use () document.write(“5 + 4 = “ + (5 + 4) + “ ”); document.write(“5 – 4 = “, 5 – 4, “ ”); document.write(“5 * 4 = “, 5 * 4, “ ”); document.write(“5 / 4 = “, 5 / 4, “ ”); // Modulus remainder of a division document.write(“5 % 4 = “, 5 % 4, “ ”); var maxNum = Number.MAX_VALUE; document.write(“Max Num = “, maxNum, “ ”); document.write(“Min Num = “, Number.MIN_VALUE, “ ”); // Numbers have 16 digits of precision precisionTest = 0.1000000000000001; document.write(precisionTest + 0.1000000000000001, “ ”); // Round number to 2 decimal places var balance = 1563.87; document.write(“Monthly payment : “, (balance / 12).toFixed(2), “ ”); var randNum = 5; // Shortcut for adding 1 document.write(“randNum++ = “, randNum++, “ ”); document.write(“++randNum = “, ++randNum, “ ”); // The same exists for – document.write(“randNum– = “, randNum—, “ ”); document.write(“–randNum = “, —randNum, “ ”); // Perform a calculation on a value and assign the result document.write(“randNum += 5 = “, randNum += 5, “ ”); document.write(“randNum -= 5 = “, randNum -= 5, “ ”); document.write(“randNum *= 5 = “, randNum *= 5, “ ”); document.write(“randNum /= 5 = “, randNum /= 5, “ ”); // Order of operations document.write(“3 + 2 * 5 = “, 3 + 2 * 5, “ ”); document.write(“(3 + 2) * 5 = “, (3 + 2) * 5, “ ”); // Math properties and methods document.write(“Math.E = “, Math.E, “ ”); document.write(“Math.PI = “, Math.PI, “ ”); document.write(“Math.abs(- = “, Math.abs(–, “ ”); document.write(“Math.cbrt(1000) = “, Math.cbrt(1000), “ ”); document.write(“Math.ceil(6.45) = “, Math.ceil(6.45), “ ”); document.write(“Math.floor(6.45) = “, Math.floor(6.45), “ ”); document.write(“Math.round(6.45) = “, Math.round(6.45), “ ”); document.write(“Math.log(10) = “, Math.log(10), “ ”); // Natural log document.write(“Math.log10(10) = “, Math.log10(10), “ ”); // Base 10 log document.write(“Math.max(10,5) = “, Math.max(10,5), “ ”); document.write(“Math.min(10,5) = “, Math.min(10,5), “ ”); document.write(“Math.pow(4,2) = “, Math.pow(4,2), “ ”); document.write(“Math.sqrt(1000) = “, Math.sqrt(1000), “ ”); document.write(“Random # (1-10) = “, Math.floor((Math.random() * 10) + 1), “ ”); // Convert strings to numbers document.write(“Converted String : “, Number(“3.14”), “ ”); document.write(“Converted Int : “, parseInt(“5”), “ ”); document.write(“Converted Float : “, parseFloat(“5.555”), “ ”); // ———- STRINGS ———- var randStr = “A long “ + “string that “ + “goes on and on”; // String length document.write(“String Length : “, randStr.length + “ ”); document.write(“Index for \”goes\” : “, randStr.indexOf(“goes”), “ ”); // Return the value using a start and end index document.write(randStr.slice(19, 23) + “ ”); // Return everything after the start index document.write(randStr.slice(19) + “ ”); // Return the value using the start index and length document.write(randStr.substr(19, 4) + “ ”); // Replace a string document.write(randStr.replace(“and on”, “forever”) + “ ”); // Get character at an index document.write(“At Index 2 : “, randStr.charAt(2) + “ ”); // Split a string into an array var randStrArray = randStr.split(” “); // Trim white space randStr = randStr.trim(); // Convert to uppercase document.write(randStr.toUpperCase() + “ ”); // Convert to lowercase document.write(randStr.toLowerCase() + “ ”); // Styling with JS var strToStyle = “Random String”; document.write(“Big : “, strToStyle.big(), “ ”); document.write(“Bold : “, strToStyle.bold(), “ ”); document.write(“Font Color : “, strToStyle.fontcolor(“blue”), “ ”); document.write(“Font Size : “, strToStyle.fontsize(“8em”), “ ”); document.write(“Italics : “, strToStyle.italics(), “ ”); document.write(“Google : “, strToStyle.link(“http://google.com”), “ ”); document.write(“Small : “, strToStyle.small(), “ ”); document.write(“Strike : “, strToStyle.strike(), “ ”); document.write(“Sub : “, strToStyle.sub(), “ ”); document.write(“Sup : “, strToStyle.sup(), “ ”); // ———- CONDITIONALS ———- // Relational Operators : == != > < >= <= // === : Equal value and type // Logical Operators : && \\ ! var age = 8; if ((age >= 5) && (age <= 6)){   document.write(“Go to Kindergarten ”); } else if (age > 18) {   document.write(“Go to College ”); } else {   document.write(“Go to Grade “, age – 5, “ ”); } document.write(“true || false = “, true || false, “ ”); document.write(“!true = “, ! true, “ ”); document.write(“\”5\” == 5 = “, (“5” == 5), “ ”); document.write(“\”5\” === 5 = “, (“5” === 5), “ ”); // Switch is used to match a limited number of options switch(age) {   case 5 :   case 6 :     document.write(“Go to Kindergarten ”);     break;   case 7 :     document.write(“Go to 1st Grade ”);     break;   default :     document.write(“Subtract 5 from your age ”); } // Ternary Operator assigns a value based on a condition // (condition) ? iftrue : ifFalse var canIVote = (age >= 18) ? true : false; document.write(“Can I Vote : “, canIVote, “ ”); // ———- LOOPING ———- // while loops as long as a condition is true var i = 1; while (i <= 10){   document.write(i, “, “);   i++; } document.write(“ ”); // do while is used when you must go through the loop at least once do{   var guess = prompt(“Guess a number between 1 and 20”); }while(guess != 15) alert(“You guessed it! 15 was the number”); // for is a self contained looping structure for(j = 0; j <= 20; j++){   // If j is divisible by 2 then skip back to the top of the loop   if((j % 2) == 0){     continue;   }   // If j is equal to 15 break completely out of the loop   if(j == 15){     break;   }   document.write(j, “, “); } document.write(“ ”); var customer = {name : “Bob Thomas”, address : “123 Main”, balance : 50.50}; // for in cycles through an enumerable properties of an object for(k in customer){   document.write(customer[k], “ ”); } // ———- ARRAYS ———- // Arrays have variable sizes and can contain multiple types in JS var tomSmith = [“Tom Smith”, “123 Main”, 120.50]; // Access first array item document.write(“1st State : “, tomSmith[0], “ ”); // Add an item tomSmith[3] = “tsmith@abc.com”; // Overwrite index 2 and fit everything else after index 2 without // overwriting (Put 0 for second parameter to not overwrite) tomSmith.splice(2, 1, “Pittsburgh”, “PA”); // Delete the 4th index item tomSmith.splice(4,1); // Convert an array into a string (Also use toString()) document.write(“Array : “, tomSmith.valueOf(), “ ”); // Convert an array into a string with separator document.write(“Array : “, tomSmith.join(“, “), “ ”); // Delete an index delete tomSmith[3]; // Sort an array (reverse() for reverse sort) // Works for sorting strings tomSmith.sort(); // Sort numbers var numbers = [4,3,9,1,20,43]; // Descending sort return y – x numbers.sort(function(x,y){ return x – y }); document.write(“Num Array : “, numbers.toString(), “ ”); // Combine arrays var combinedArray = numbers.concat(tomSmith); // Remove the last item tomSmith.pop(); // Add items to the end tomSmith.push(“555-1212”, “US”); // Deletes the first item tomSmith.shift(); // Adds item to the first index tomSmith.unshift(“Tom Smith”); for (var i = 0; i < tomSmith.length; i++) {   document.write(tomSmith[i], “ ”); } // ———- FUNCTIONS ———- // Functions provide code reuse and eliminate repetitive code // Define a function that checks if a value is in an array function inArray(arrayToCheck, value){   for(i = 0; i < arrayToCheck.length; i++){     if(arrayToCheck[i] === value){       return true;     }   }   return false; } var randArray = [1,2,3,4,5]; document.write(“In Array : “, inArray(randArray, 4), “ ”); // Local variables defined in functions can’t be accessed outside of // the function function times2(num){   var var2 = 2;   return num * var2; } // Causes Error : document.write(“Val of var2 : “, var2, “ ”); // Pass a function as a parameter function times3(num){   return num * 3; } function multiply(func, num){   return func(num); } document.write(“3 * 15 = “, multiply(times3, 15), “ ”); // Define a function expression // We can assign functions to variables, store them in arrays, // pass them into other functions and return them from functions var triple = function(num){   return num * 3; }; document.write(“3 * 45 = “, multiply(triple, 45), “ ”); // Receive variable number of arguments function getSum(){   var sum = 0;   for(i = 0; i < arguments.length; i++){     sum += arguments[i];   }   return sum; } document.write(“Sum : “, getSum(1,2,3,4,5), “ ”); // Return a variable number of values function times2(theArray){   var newArray = [];   for(i = 0; i < theArray.length; i++){     newArray.push(theArray[i] * 2);   }   return newArray; } document.write(“Array Doubled : “, times2([1,2,3,4,5]).toString(), “ ”); // Recursive Function function factorial(num){   if(num <= 1){     return 1;   } else {     return num * factorial(num – 1);   } } document.write(“Factorial of 4 : “, factorial(4), “ ”); // 1st: num = 4 * factorial(3) = 4 * 6 = 24 // 2nd: num = 3 * factorial(2) = 3 * 2 = 6 // 3rd: num = 2 * factorial(1) = 2 * 1 = 2 // ———- EVENT HANDLING ———- function openAlert(mess){   alert(mess); } // ———- DATE ———- // Get a Date object var curDate = new Date(); document.write(“Date : “, curDate.getDate(), “ ”); document.write(“Month : “, curDate.getMonth(), “ ”); document.write(“Day : “, curDate.getDay(), “ ”); document.write(“Year : “, curDate.getFullYear(), “ ”); document.write(“Time : “, curDate.getHours(), “:”, curDate.getMinutes(),   “:”, curDate.getSeconds(), “:”, curDate.getMilliseconds(), “ ”); // Create a Date object for my birthday var myBD = new Date(“December 21, 2015”); var msForBD = myBD.getTime(); var timeNow = curDate.getTime(); var tilMyBD = msForBD – timeNow; document.write(“Days til Birthday : “, tilMyBD / (1000 * 60 * 60 * 24), “ ”); [You must be registered and logged in to see this link.] –> [You must be registered and logged in to see this link.] onmouseout=“this.style.color=’blue’;” ondblclick=“this.text=’You Double Clicked Me'” onmousedown=“this.text=’Don\’t Press So hard'” onmouseup=“this.text=’Thank You'”>Make me Red onChange=“var dataEntered=document.getElementById(‘randInput’).value; alert(‘User Typed ‘ + dataEntered);”> Key Data Here

Mouse X:

Mouse Y:




function getChar(event) {
  // event.which returns the key or mouse button clicked
  if (event.which == null) {
    // Return the char if not a special character
    return String.fromCharCode(event.keyCode); // IE
  } else if (event.which!=0 && event.charCode!=0) {
    return String.fromCharCode(event.which);   // Other Browsers
  } else {
    return null; // Special Key Clicked
  }
}
document.getElementById(‘charInput’).onkeypress = function(event) {
  var char = getChar(event || window.event)
  if (!char) return false; // Special Key Clicked
  document.getElementById(‘keyData’).innerHTML = char + ” was clicked”;
  return true;
}
// Change text when the input gains focus
document.getElementById(‘charInput’).onfocus = function(event) {
  document.getElementById(‘keyData’).innerHTML = “Input Gained Focus”;
}
// Change text when the input loses focus
document.getElementById(‘charInput’).onblur = function(event) {
  document.getElementById(‘keyData’).innerHTML = “Input Lost Focus”;
}
// Change text when text is selected
document.getElementById(‘charInput’).onselect = function(event) {
  document.getElementById(‘keyData’).innerHTML = “Text Selected”;
}
// Add a listener that triggers a function on browser resize
window.addEventListener(“resize”, browserResized);
function browserResized() {
  document.getElementById(‘keyData’).innerHTML = “I’ve been resized”;
}
// Make image invisible on click
document.getElementById(‘logo’).onclick = function(event) {
  // Change the class for the image
  document.getElementById(‘logo’).className = “hidden”;
  // Change the input element value
  document.getElementById(‘mouseInput’).value = “Clicked on image with button “ + event.button;
}
// Make image visible on click
document.getElementById(‘logoButton’).onclick = function(event) {
  document.getElementById(‘logo’).className = “show”;
}
// Change image src on mouseover
document.getElementById(‘logo’).onmouseover = function(event) {
  document.getElementById(‘logo’).src = “ntt-logo-horz.png”;
  document.getElementById(‘mouseInput’).value = “Mouse Over image”;
}
// Change image src back on mouseout
document.getElementById(‘logo’).onmouseout = function(event) {
  document.getElementById(‘logo’).src = “ntt-logo.png”;
  document.getElementById(‘mouseInput’).value = “Mouse Left image”;
}
// Get mouse x y coordinates
document.body.onmousemove = function(e) {
    e = e || window.event;
    // Get pageX, pageY : Mouse position relative to the html doc
    var pageX = e.pageX;
    var pageY = e.pageY;
    if (pageX === undefined) {
        // clientX, clientY : Mouse position relative to the browsers viewport
        // scrollLeft, scrollTop : Pixels an element is scrolled left or
        // from the top
        pageX = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
        pageY = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
    }
    document.getElementById(‘mouseX’).value = pageX;
    document.getElementById(‘mouseY’).value = pageY;
};
// Clear all input elements
document.getElementById(‘clearInputs’).onclick = function(event) {
  var inputElements = document.getElementsByTagName(‘input’);
  for (var i = 0; i < inputElements.length; i++) {
  if (inputElements[i].type == “text”) {
    inputElements[i].value = “”;
  }
}
}


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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin eget turpis eget quam luctus malesuada ut ac nulla. Suspendisse fermentum magna neque, a auctor felispretium eget. Fusce ornare feugiat magna, ut faucibus sapien congue ut. Nunc nec fringilla ex, nec varius nisl. Ut eget laoreet nisi. Aenean quis venenatis mauris, atvolutpat ante. Donec sollicitudin lacinia ornare. In quis accumsan ligula, id egestas enim.







// Change background color
document.getElementById(‘chgBkColor’).onclick = function(event) {
  document.getElementById(‘sampDiv’).style.backgroundColor = “[You must be registered and logged in to see this link.]”;
}
// Change background image
document.getElementById(‘chgBkImg’).onclick = function(event) {
  document.getElementById(‘sampDiv’).style.backgroundImage = “url(‘repeatBkgrnd.png’)”;
}
// Change border style
document.getElementById(‘chgBorderStyle’).onclick = function(event) {
  document.getElementById(‘sampDiv’).style.borderStyle = “solid”;
}
// Change border width
document.getElementById(‘chgBorderWidth’).onclick = function(event) {
  document.getElementById(‘sampDiv’).style.borderWidth = “thick”;
}
// Change border color
document.getElementById(‘chgBorderColor’).onclick = function(event) {
  document.getElementById(‘sampDiv’).style.borderColor = “blue”;
}


Lorem ipsum dolor sit amet, elit. Proin eget turpis eget quam luctus malesuada ut ac nulla. Suspendissefermentum magna neque, a auctor felis pretium eget. Fusce ornare feugiat magna, ut faucibus sapien congue ut. Nunc nec fringilla ex, nec varius nisl. Ut eget laoreetnisi. Aenean quis venenatis mauris, at volutpat ante. Donec sollicitudin lacinia ornare. In quis accumsan ligula, id egestas enim.
Lorem ipsum dolor sit amet,consectetur adipiscing elit. Proin eget turpis eget quam luctus malesuada ut ac nulla. Suspendisse fermentum magna neque, a auctor felis pretium eget. feugiat magna, ut faucibus sapien congue ut. Nunc nec fringilla ex, nec varius nisl.

// Get current web page info document.write(“Current URL : “, window.location.href, “ ”); document.write(“Current Host : “, window.location.hostname, “ ”); document.write(“Current Path : “, window.location.pathname, “ ”); // Change site on button click document.getElementById(‘goToGoogle’).onclick = function(event) {   window.location.href = “http://google.com”;   // OR   // window.location.assign(“http://google.com”); } // Go forward a page on click document.getElementById(‘forwardPage’).onclick = function(event) {   history.forward(); } // Go back a page on click document.getElementById(‘forwardPage’).onclick = function(event) {   history.back(); } // Use history.go(-2) or history.go(2) to jump multiple pages // Reload page on button click document.getElementById(‘reload’).onclick = function(event) {   window.location.reload(true); } // You can get all ps and then target them like an array var pElements = document.getElementsByTagName(‘p’); pElements[3].style.backgroundColor = “[You must be registered and logged in to see this link.]”; // Target the html document.childNodes[1].style.backgroundColor = “[You must be registered and logged in to see this link.]”; // Change the color of the 1st child in sampDiv2 var sampDiv2 = document.getElementById(‘sampDiv2’); sampDiv2.childNodes[0].style.backgroundColor = “[You must be registered and logged in to see this link.]”; // Style the 1st child of sampDivs 1st child sampDiv2.childNodes[0].childNodes[1].style.backgroundColor = “[You must be registered and logged in to see this link.]”; // JavaScript can get confused by text nodes when targeting elements // Text nodes are whitespace, which nodeType will identify with a 3 // while elements as a 1 // You can eliminate text nodes by deleting whitespace or by using a // minimizer (lastChild and firstChild may not work) document.write(“Node Type : “, sampDiv2.childNodes[0].childNodes[0].nodeType, “ ”); document.write(“Node Name : “, sampDiv2.childNodes[0].childNodes[0].nodeName, “ ”); sampDiv2.childNodes[1].childNodes[3].style.backgroundColor = “[You must be registered and logged in to see this link.]”; // Changing element attributes var nttLogo2 = document.getElementById(‘logo2’); // Check for attributes document.write(“Logo has alt : “, nttLogo2.hasAttribute(“alt”), “ ”); // Change attribute nttLogo2.setAttribute(“alt”, “NTT Logo 2”); // Get attribute document.write(“Logo alt Value : “, nttLogo2.getAttribute(“alt”), “ ”); // Get all attributes and print them var attribList = document.getElementById(‘logo2’).attributes; for(i = 0; i < attribList.length; i++){   document.write(“Attribute “, i, ” : “, attribList[i].nodeName, ” : “, attribList[i].nodeValue, “ ”); } // Add a p element after setting an attribute and text var paragraph3 = document.createElement(“p”); paragraph3.setAttribute(“id”, “paragraph3”); paragraph3.innerHTML = “Proin eget turpis eget quam luctus malesuada ut ac nulla.”; sampDiv2.appendChild(paragraph3); // Insert the element before the 1st child sampDiv2.insertBefore(paragraph3, sampDiv2.childNodes[0]); // Create a customer object by defining the attributes of John Smith // The variable is a reference to the object in memory var cust1 = {   name: “John Smith”,   street: “123 Main”,   city: “Pittsburgh”,   state: “PA”,   email: “jsmith@abc.com”,   balance: 120.50,   payDownBal: function(amtPaid){     this.balance -= amtPaid;   },   addToBal: function(amtCharged){     this.balance += amtCharged;   } }; // Retrieve the value for the object document.write(“Customer Name : “, cust1.name, “ ”); // Change the value for the object cust1.street = “215 Main St”; document.write(“Customer Address : “, cust1.street, “ ”); // Add a property to cust1 cust1.country = “US”; document.write(“Customer Country : “, cust1.country, “ ”); // Delete a property delete cust1.country; // Cycle through all the properties for the object for (var prop in cust1) {     if (cust1.hasOwnProperty(prop)) {         document.write(prop, “ ”);     } } // Check if a property is in an object document.write(“name in cust1 : “, “name” in cust1, “ ”); // Interact with an object using a function function getInfo(cust){   return cust1.name + ” lives at “ + cust1.street + ” in “ + cust1.city + ” “ + cust1.state + ” email : “ + cust1.email + ” and has a balance of $” + cust1.balance; } document.write(getInfo(cust1), “ ”); // Call object methods cust1.payDownBal(20.50); cust1.addToBal(10.00); document.write(getInfo(cust1), “ ”); // Create an object constructor function Customer(name, street, city, state, email, balance){   this.name = name;   this.street = street;   this.city = city;   this.state = state;   this.email = email;   this.balance = balance;   this.payDownBal = function(amtPaid){     this.balance -= amtPaid;   };   this.addToBal = function(amtCharged){     this.balance += amtCharged;   }; } var cust2 = new Customer(“Sally Smith”, “234 Main”, “Pittsburgh”, “PA”, “ssmith@abc.com”, 0.00); cust2.addToBal(15.50); // Define a shared prototype property for all objects Customer.prototype.isCreditAvail = true; // We define prototype methods that are shared by every object created Customer.prototype.toString = function(){     return this.name + ” lives at “ + this.street + ” in “ + this.city + ” “ + this.state + ” email : “ + this.email + ” and has a balance of $” + this.balance.toFixed(2) +” Creditworthy : “ + this.isCreditAvail; }; document.write(cust2.toString()); Enter your name: Enter your street address: Enter your city: Enter your state code: Enter your phone number: onblur=“isPhoneOk(this, document.getElementById(‘phone_help’))” /> Enter your email: function editNodeText(regex, input, helpId, helpMessage) {   // See if the info matches the regex that was defined   // If the wrong information was entered, warn them   if (!regex.test(input)) {     if (helpId != null)       // We need to show a warning       // Remove any warnings that may exist       while (helpId.childNodes[0]){         helpId.removeChild(helpId.childNodes[0]);       }       // Add new warning       helpId.appendChild(document.createTextNode(helpMessage));     } else {       // If the right information was entered, clear the help message       if (helpId != null){         // Remove any warnings that may exist         while (helpId.childNodes[0]){           helpId.removeChild(helpId.childNodes[0]);         }       }     } } // inputField – ID Number for the html text box // helpId – ID Number for the child node I want to print a warning in function isTheFieldEmpty(inputField, helpId) {   // See if the input value contains any text   return editNodeText(/^[A–Za–z\.\‘ \–]{1,15}\s?[A–Za–z\.\‘ \–]{1,15}\s?[A–Za–z\.\‘ \–]{1,15}/, inputField.value, helpId, “Please enter a valid name.”); } // inputField.value – Value typed in the html text box function isAddressOk(inputField, helpId) {   return editNodeText(/^[A–Za–z0–9\.\‘ \–]{5,30}$/, inputField.value, helpId, “Enter a Street (Ex.1234 Main St.)”); } function isStateOk(inputField, helpId) {   returneditNodeText(/^A[LKSZRAEP]|C[AOT]|D[EC]|F[LM]|G[AU]|HI|I[ADLN]|K[SY]|LA|M[ADEHINOPST]|N[CDEHJMVY]|O[HKR]|P[ARW]|RI|S[CD]|T[NX]|UT|V[AIT]|W[AIVY]$/,inputField.value, helpId, “Enter a State Code in Uppercase (Ex.NY, PA, CA)”); } function isPhoneOk(inputField, helpId) {   return editNodeText(/^([0–9]( |–)?)?(\(?[0–9]{3}\)?|[0–9]{3})( |–)?([0–9]{3}( |–)?[0–9]{4}|[a–zA–Z0–9]{7})$/, inputField.value, helpId, “Enter a Phone Number (Ex.412-828-3000)”); } function isEmailOk(inputField, helpId) {   return editNodeText(/^[A–Za–z0–9._–]+@[A–Za–z0–9.–]+\.[A–Za–z]{2,4}$/, inputField.value, helpId, “Enter an Email (Ex. [You must be registered and logged in to see this link.])”); } // Through exception handling we can catch and manage errors rather then // crashing by surrounding problem code in a try block and handling it // in a catch block var custArray = [“Tom”, “Bob”, “Sally”, “Sue”]; var getCust = function(index){   if(index > custArray.length){     throw new RangeError(“Index must be >= 0 and <= “ + custArray.length );   } else {     return custArray[index];   } } try {   document.write(“Customer : “, getCust(5), “ ”); } catch(ex){   if (ex instanceof RangeError){     document.write(ex.message + “ ”);   } }

I hope you liked it.