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stack.js
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stack.js
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class Stack {
constructor(data = {}, count = 0) {
this.data = data;
this.count = count;
}
push(value) {
this.data[this.count] = value;
this.count++;
}
pop() {
if (this.count === 0) {
return undefined
}
this.count--;
var result = this.data[this.count];
delete this.data[this.count];
return result
}
size() {
return this.count;
}
peek() {
return this.data[this.count - 1]
}
}
const s1 = new Stack();
s1.push(10);
s1.push(20)
s1.push(30)
s1.push(40)
console.log(s1)
console.log("Peek at top of stack", s1.peek())
console.log("Popped", s1.pop());
s1.push("Hello World is full of foos");
console.log(s1.peek())
console.log(s1)
s1.pop();
s1.pop();
s1.pop();
console.log(s1)