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TypeScriptConnected

Strings / Data StructuresEasy

Valid Parentheses

Given a string s containing bracket characters, determine if the string is valid in correct order.

Live Participants (2)

Nick (Interviewer)

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Alex (Candidate)

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function isValid(s: string): boolean {

// Stack-based bracket matcher implementation

const stack: string[] = [];

const map = { ')': '(', '}': '{', ']': '[' };

for (const char of s) {Nick

if (map[char]) {

if (stack.pop() !== map[char]) return false;

} else stack.push(char);

}

return stack.length === 0;

}

console.log(isValid("()[]")); // true

Console OutputCompleted (1.4ms)

=> true

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View All 26+ Problems

Strings / Data Structureseasy

Valid Parentheses

Given a string `s` containing just the characters `'('`, `')'`, `'{'`, `'}'`, `'['` and `']'`, determine if the input string is valid. An input string is valid if: 1. Open brackets must be closed by the same type of brackets. 2. Open brackets must be closed in the correct order. 3. Every close bracket has a corresponding open bracket of the same type.

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Arrays & Hashingeasy

Two Sum

Given an array of integers `nums` and an integer `target`, return indices of the two numbers such that they add up to `target`. You may assume that each input would have exactly one solution, and you may not use the same element twice.

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Linked Listseasy

Reverse Linked List

Given the head of a singly linked list, reverse the list, and return the reversed list.

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JavaScript Utilitieseasy

Implement Debounce

Implement a `debounce` function that delays invoking `fn` until after `delay` milliseconds have elapsed since the last time the debounced function was invoked.

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API & BackendCode Review

Code Review: Inefficient API Implementation

Review the following search API route handler. Identify unnecessary work, missing database pagination, over-fetching raw data, and security exposures.

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TypeScript & ArchitectureCode Review

Code Review: Bad TypeScript Design

Review the following TypeScript data mapper. Identify type safety flaws, excessive `any` usage, unsafe type assertions (`as any`), and weak interfaces. Refactor for strict type safety.

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