JavaScript Exercises: Create a copy of the stack
JavaScript Stack: Exercise-25 with Solution
Write a JavaScript program to implement a stack that creates a copy of the stack.
Sample Solution:
JavaScript Code:
class Stack {
constructor() {
this.items = [];
}
push(element) {
this.items.push(element);
}
pop() {
if (this.items.length == 0) {
return "Underflow";
}
return this.items.pop();
}
peek() {
return this.items[this.items.length - 1];
}
isEmpty() {
return this.items.length == 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();
}
copy() {
var copiedStack = new Stack();
copiedStack.items = [...this.items];
return copiedStack;
}
}
var stack1 = new Stack();
stack1.push(10);
stack1.push(20);
stack1.push(30);
stack1.push(40);
stack1.push(50);
console.log(stack1.displayStack(stack1));
var stack2 = stack1.copy();
console.log("Create a copy of the said stack:")
console.log(stack2.displayStack(stack2));
Sample Output:
Stack elements are: 10 20 30 40 50 Create a copy of the said stack: Stack elements are: 10 20 30 40 50
Flowchart:



Live Demo:
See the Pen javascript-stack-exercise-25 by w3resource (@w3resource) on CodePen.
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Stack Previous: Concatenates two stacks into a new stack.
Stack Exercises Next: Check if a stack is a subset of another 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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