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| function List() {
this.listSize = 0;
this.pos = 0;
this.dataStore = [];
this.append = append;
this.remove = remove;
this.find = find;
this.length = length;
this.toString = toString;
this.insert = insert;
this.clear = clear;
this.contains = contains;
this.front = front;
this.end = end;
this.prev = prev;
this.next = next;
this.currPos = currPos;
this.moveTo = moveTo;
this.getElement = getElement;
this.hasNext = hasNext;
this.hasPrev = hasPrev;
}
function append(element) {
this.dataStore[this.listSize++] = element;
}
function find(element) {
for (var i = 0; i < this.dataStore.length; ++i) {
if (this.dataStore[i] == element) {
return i;
}
}
return -1;
}
function length() {
return this.listSize;
}
function toString() {
return this.dataStore;
}
function remove(element) {
var foundAt = this.find(element);
if (foundAt > -1) {
this.dataStore.splice(foundAt,1);
--this.listSize;
return true;
}
return false;
}
function insert(element, after) {
var insertPos = this.find(after);
if (insertPos > -1) {
this.dataStore.splice(insertPos + 1, 0 , element);
++this.listSize;
return true;
}
return false;
}
function clear() {
delete this.dataStore;
this.dataStore.length = 0;
this.listSize = this.pos = 0;
}
function contains(element) {
for (var i = 0; i < this.dataStore.length; i++) {
if (this.dataStore[i] == element) {
return true;
}
}
return false;
}
function front() {
this.pos = 0;
}
function end() {
this.pos = this.listSize - 1;
}
function prev() {
if (this.pos > 0) {
--this.pos;
}
}
function next() {
if (this.pos < this.listSize) {
++this.pos;
}
}
function currPos() {
return this.pos;
}
function moveTo(position) {
this.pos = position;
}
function getElement() {
return this.dataStore[this.pos];
}
function hasNext() {
return this.pos < this.listSize;
}
function hasPrev() {
return this.pos > 0;
}
var names = new List();
names.append("Cynthia");
names.append("Raymond");
names.insert("Barbara", "Cynthia");
console.log(names.toString());
names.remove("Raymond");
console.log(names.toString());
for (names.front(); names.hasNext(); names.next()) {
console.log(names.getElement());
}
|
