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Implementation of Stack in JavaScript
Following is the code to implement stack in JavaScript −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.result {
font-size: 18px;
font-weight: 500;
color: blueviolet;
}
button {
padding: 6px;
margin: 4px;
}
</style>
</head>
<body>
<h1>Implementation of Stack in JavaScript.</h1>
<div class="result"></div>
<br />
<input type="text" class="stackPush" /><button class="pushBtn">Push</button>
<button class="popBtn">Pop</button>
<button class="Btn">Display</button>
<h3>Click on the above buttons to perform stack operations</h3>
<script>
let resEle = document.querySelector(".result");
let BtnEle = document.querySelector(".Btn");
let pushBtnEle = document.querySelector(".pushBtn");
let popBtnEle = document.querySelector(".popBtn");
class Stack {
constructor() {
this.items = [];
this.top = 0;
}
}
Stack.prototype.push = function (ele) {
this.items[this.top] = ele;
this.top += 1;
};
Stack.prototype.pop = function () {
if (this.top === 0) {
return "Underflow: no more elements to delete";
}
tempNum = this.items[this.top - 1];
this.items.length -= 1;
return tempNum;
};
Stack.prototype.display = function () {
if (this.top == 0) {
return "Stack is empty";
}
for (let i = 0; i < this.top; i++) {
resEle.innerHTML += this.items[i] + " , ";
}
};
let stack1 = new Stack();
BtnEle.addEventListener("click", () => {
resEle.innerHTML = "";
stack1.display();
});
pushBtnEle.addEventListener("click", () => {
let ele = document.querySelector(".stackPush").value;
resEle.innerHTML = ele + " is pushed to the stack";
stack1.push(ele);
});
popBtnEle.addEventListener("click", () => {
resEle.innerHTML = stack1.pop() + " is popped from the stack";
});
</script>
</body>
</html>Output
On entering number in the field and clicking on ‘Push’ −
On clicking the ‘Pop’ button −
On clicking the ‘Display’ button when the stack is not empty −
Updated on: 20-Jul-2020
310 Views
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