JavaScript Exercises: Top and bottom elements of a stack
JavaScript Stack: Exercise-10 with Solution
Top & Bottom of Stack
Write a JavaScript program to find the top and bottom elements of a given stack.
Sample Solution:
JavaScript Code:
class Stack {
constructor() {
this.items = [];
}
push(element) {
this.items.push(element);
}
pop() {
if (this.isEmpty())
return "Underflow";
return this.items.pop();
}
peek() {
if (this.isEmpty())
return "No elements in Stack";
return this.items[this.items.length - 1];
}
isEmpty() {
return this.items.length === 0;
}
get_Top() {
return this.items[this.items.length - 1];
}
get_Bottom() {
return this.items[0];
}
displayStack(stack) {
console.log("Stack elements are:");
let str = "";
for (let i = 0; i < stack.items.length; i++)
str += stack.items[i] + " ";
return str.trim();
}
}
console.log("Initialize a stack:")
let stack = new Stack();
console.log("Input some elements on the stack:")
stack.push(1);
stack.push(6);
stack.push(3);
stack.push(2);
stack.push(5);
stack.push(7);
console.log(stack.displayStack(stack));
console.log("Top element of the stack is:", stack.get_Top());
console.log("Bottom element of the stack is:", stack.get_Bottom());
Sample Output:
"Initialize a stack:" "Input some elements on the stack:" "Stack elements are:" "1 6 3 2 5 7" "Top element of the stack is:" 7 "Bottom element of the stack is:" 1
Flowchart:
Live Demo:
* To run the code mouse over on Result panel and click on 'RERUN' button.*
Live Demo:
See the Pen javascript-common-editor by w3resource (@w3resource) on CodePen.
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Stack Previous: Remove duplicates from a given stack .
Stack Exercises Next: Rotate the stack elements to the left.
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