class Stack {
private items:number[];
constructor() {
this.items = [];
}
add(element: number) : number {
return this.items.push(element);
}
size() {
return this.items.length;
}
pop() {
if (this.items.length > 0) {
return this.items.pop();
} else return -1
}
peek() {
return this.items[this.items.length - 1];
}
isEmpty() {
return this.items.length == 0;
}
print() {
let s:string = ""
for (let i = 0; i < this.items.length; i++) {
s += this.items[i] + ", ";
}
console.log(s);
}
delete() {
this.items = [];
}
}
let stack = new Stack();
stack.add(3);
stack.add(0);
stack.add(7);
stack.add(2);
stack.add(9);
stack.add(5);
stack.print();
stack.pop();
stack.print();
console.log(stack.peek());
console.log("size: " + stack.size());
console.log(stack.isEmpty());
stack.pop();
stack.print();
stack.delete();
stack.print();
/*
run:
"3, 0, 7, 2, 9, 5, "
"3, 0, 7, 2, 9, "
9
"size: 5"
false
"3, 0, 7, 2, "
""
*/
