Stack and queue in JavaScript
Practice this questionWANT TO UNDERSTAND THE CONCEPT FIRST?Learn Stack and queue in JavaScript
Stack using array
const stack = [];
stack.push(1);
stack.push(2);
stack.pop();Queue using array
const queue = [];
queue.push(1);
queue.push(2);
queue.shift();Problems to practice
- Valid Parentheses
- Min Stack
- Daily Temperatures
- Sliding Window Maximum
- Implement Queue Using Stack
- Implement Stack Using Queue
Example: valid parentheses
function isValid(s) {
const stack = [];
const pairs = { ')': '(', ']': '[', '}': '{' };
for (const ch of s) {
if (['(', '[', '{'].includes(ch)) stack.push(ch);
else {
if (stack.pop() !== pairs[ch]) return false;
}
}
return stack.length === 0;
}Adapted from 16_DSA_JAVASCRIPT.md · “5. Stack and queue in JavaScript”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.