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/*
* Stack
* Simple implementation of a stack using Array().
*/
function Stack() {
this.a = new Array();
this.length = 0;
};
// Push an item.
Stack.prototype.push = function(obj) {
this.a.push(obj);
this.length++;
};
// Pop an item.
Stack.prototype.pop = function() {
if (this.isEmpty()) {
throw('Stack.pop(): Pop from empty stack.');
};
this.length--;
return this.a.pop();
};
// Check if stack is empty.
Stack.prototype.isEmpty = function() {
if (this.length == 0) {
return true;
};
return false;
};
// Get an item at position index.
Stack.prototype.get = function(index) {
return this.a[index];
};
// Deep copy a stack.
Stack.prototype.copy = function() {
var c = ((new Array()).concat(this.a));
var ret = new Stack();
ret.a = c;
ret.length = this.length;
return ret;
};
// String representation.
Stack.prototype.str = function(separator) {
if (!separator) { separator=' ' };
var a = new Array();
for (var i=0; i < this.length; i++) {
a.push(this.a[i].id);
};
return a.join(separator);
};
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