js-stack-implementation/stack.js at main · aneesh-acharyeah/js-stack-implementation · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
classStack{
constructor(){
this.item=[];// initialize with an empty array
}
is_empty(){
returnthis.item.length===0;
}
push(n){
this.item.push(n);
}
pop(){
if(!this.is_empty()){
console.log(this.item.pop());
}else{
alert("No element is there in the stack");
}
}
peek(){
if(!this.is_empty()){
console.log(this.item[this.item.length-1]);
}else{
alert("No element in the stack to peek");
}
}
size(){
returnconsole.log(this.item.length);
}
}


constst=newStack();
st.push(10);
st.push(20);
st.peek();// output: 20
st.size();// output: 2
st.pop();// output: 20
st.pop();// output: 10
st.pop();// alert: no element is there in the stack