JavaScript Exercises: Count all the elements in a given stack
JavaScript Stack: Exercise-7 with Solution
Write a JavaScript program to count all the elements in 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;
}
// Returns the number of elements in the stack
size() {
return this.items.length;
}
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("Number of elements in the said stack:")
console.log(stack.count());
console.log("Input some elements on the stack:")
stack.push(1);
stack.push(4);
stack.push(3);
stack.push(2);
stack.push(5);
stack.push(6);
console.log(stack.displayStack(stack));
console.log("Number of elements in the said stack:")
console.log(stack.count());
stack.pop();
stack.pop();
console.log("Remove two elements from the said stack:")
console.log(stack.displayStack(stack));
console.log("Number of elements in the said stack:")
console.log(stack.count());
Sample Output:
"Initialize a stack:" "Number of elements in the said stack:" 0 "Input some elements on the stack:" "Stack elements are:" "1 4 3 2 5 6" "Number of elements in the said stack:" 6 "Remove two elements from the said stack:" "Stack elements are:" "1 4 3 2" "Number of elements in the said stack:" 4
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 all the elements from a given stack.
Stack Exercises Next: Check if an element is present or not in a stack.
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JavaScript: Tips of the Day
Creates an array of elements, ungrouping the elements in an array produced by zip and applying the provided function
Example:
const tips_unzip = (arr, fn) => arr .reduce( (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc), Array.from({ length: Math.max(...arr.map(x => x.length)) }).map(x => []) ) .map(val => fn(...val)); console.log(tips_unzip([[2, 15, 200], [3, 25, 300]], (...args) => args.reduce((acc, v) => acc + v, 0)));
Output:
[5, 40, 500]
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