Top 10 Typescript Interview Problems and Solutions You Must Prepare in 2024
Top 10 Typescript Interview Problems and Solutions You Must Prepare in 2024
- Write a function that reverses a string.
function reverseString(str: string): string {
return str.split('').reverse().join('');
}
- Write a function that checks if a given string is a palindrome.
function isPalindrome(str: string): boolean {
const reversed = str.split('').reverse().join('');
return str === reversed;
}
- Write a function to calculate the factorial of a given number.
function factorial(n: number): number {
if (n === 0 || n === 1) return 1;
return n * factorial(n - 1);
}
- Write a function to generate the Fibonacci sequence up to a given number.
function fibonacci(n: number): number[] {
const sequence = [0, 1];
for (let i = 2; i <= n; i++) {
sequence[i] = sequence[i - 1] + sequence[i - 2];
}
return sequence;
}
- Write a function to sort an array of numbers.
function sortArray(arr: number[]): number[] {
return arr.slice().sort((a, b) => a - b);
}
- Write a function to find the first duplicate element in an array.
function findDuplicate(arr: number[]): number | undefined {
const set = new Set<number>();
for (const num of arr) {
if (set.has(num)) {
return num;
}
set.add(num);
}
return undefined;
}
- Write a function to perform binary search on a sorted array.
function binarySearch(arr: number[], target: number): number {
let low = 0;
let high = arr.length - 1;
while (low <= high) {
const mid = Math.floor((low + high) / 2);
if (arr[mid] === target) return mid;
if (arr[mid] < target) low = mid + 1;
else high = mid - 1;
}
return -1;
}
- Given an object, write a function to remove a property by key.
function removeProperty(obj: Record<string, any>, key: string): void {
delete obj[key];
}
- Write a function to deep clone an object.
function deepClone(obj: Record<string, any>): Record<string, any> {
return JSON.parse(JSON.stringify(obj));
}
- Write an asynchronous function that fetches data from an API using Promises and Async/Await.
async function fetchData(url: string): Promise<any> {
const response = await fetch(url);
const data = await response.json();
return data;
}
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