Melipone

// Exercise 2-1
// in console
// Exercise 2-2
var init = 1;
var k = 1;
while (k++ <= 10)
    init = init * 2;
print (init);
// Exercise 2-3
var str = "";

Melipone

// Exercise 3.1

function absolute (num) {
  if (num >= 0)
    return num;
  return (- num);
}

// I realize that testing the other branch first is more efficient

Melipone

//Ex. 4.2

function range (num) {
    var arr = [];
    if (isNaN(Number(num)))
	alert ("Invalid number");
    else
	for (var i=0;i<num;i++)
	    arr[i]=i;
    return arr;

Melipone

var test = function () {
    function first () {
	print ("first");
    }
    function second () {
	print ("second");
    }
};
// add a function to Object.prototype
Object.prototype.getOwnMethods = function(){

Melipone

// coming soon
// Ex. 6.1

function forEach(array, action) {
  for (var i = 0; i < array.length; i++)
    action(array[i]);
}

function reduce(combine, base, array) {
  forEach(array, function (element) {

Melipone

<script type="text/javascript">
function walkTheDOM(node, func) {
        func(node); 
        node = node.firstChild; 
        while (node) { 
            walkTheDOM(node, func); 
            node = node.nextSibling; 
        } 
    } 
function countTextNodes() {

Melipone

<script type="text/javascript">
function walkTheDOM(node, func) {
        func(node); 
        node = node.firstChild; 
        while (node) { 
            walkTheDOM(node, func); 
            node = node.nextSibling; 
        } 
    } 
function countTextNodes() {

Melipone

<script type="text/javascript">
function walkTheDOM(node, func) {
        func(node); 
        node = node.firstChild; 
        while (node) { 
            walkTheDOM(node, func); 
            node = node.nextSibling; 
        } 
    } 
function countTextNodes() {

Melipone

// Ex. 12.1

//Write a function asHTML which, when given a DOM node, 
//produces a string representing the HTML text for that node 
//and its children. You may ignore attributes, just show nodes 
//as <nodename>. The escapeHTML function from chapter 10 is 
//available to properly escape the content of text nodes.

function escapeHTML(text) {
  var replacements = {"<": "&lt;", ">": "&gt;",

Melipone

// Ex 13.1 of Chapter 13 in Eloquent Javascript

// Write a function called registerEventHandler to wrap the
// incompatibilities of these two models. It takes three arguments: first
// a DOM node that the handler should be attached to, then the name of
// the event type, such as "click" or "keypress", and finally the handler
// function. 

function registerEventHandler (node, eventType, handlerFN) {
 	 if (node.attachEvent) { //IE