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TypeScript Coding Questions


  • Write a TypeScript function to calculate the sum of two numbers.
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function add(a: number, b: number): number {
  return a + b;
}
  • Write a TypeScript function to find the maximum number in an array of numbers.
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function findMax(arr: number[]): number {
  let max = arr[0];
  for (let i = 1; i < arr.length; i++) {
    if (arr[i] > max) {
      max = arr[i];
    }
  }
  return max;
}
  • Write a TypeScript class that represents a rectangle with a given width and height.
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class Rectangle {
  private width: number;
  private height: number;

  constructor(width: number, height: number) {
    this.width = width;
    this.height = height;
  }

  getArea(): number {
    return this.width * this.height;
  }
}
  • Write a TypeScript function to capitalize the first letter of a string.
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function capitalize(str: string): string {
  return str.charAt(0).toUpperCase() + str.slice(1);
}
  • Write a TypeScript function to filter an array of numbers to remove any negative numbers.
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function filterPositive(arr: number[]): number[] {
  return arr.filter((num) => num >= 0);
}
  • Write a TypeScript function to remove duplicates from an array of numbers.
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function removeDuplicates(arr: number[]): number[] {
  return Array.from(new Set(arr));
}
  • Write a TypeScript function to find the second largest number in an array of numbers.
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function findSecondLargest(arr: number[]): number {
  arr.sort((a, b) => b - a);
  return arr[1];
}
  • Write a TypeScript function to calculate the factorial of a number.
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function factorial(num: number): number {
  if (num <= 1) {
    return 1;
  }
  return num * factorial(num - 1);
}
  • Write a TypeScript function to convert a string to a number.
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function stringToNumber(str: string): number {
  return Number(str);
}
  • Write a TypeScript function to check if a string contains a substring.
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function containsSubstring(str: string, substring: string): boolean {
  return str.includes(substring);
}
  • Write a TypeScript function to reverse a string.
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function reverseString(str: string): string {
  return str.split("").reverse().join("");
}
  • Write a TypeScript function to check if an array of numbers is sorted in ascending order.
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function isSortedAscending(arr: number[]): boolean {
  for (let i = 0; i < arr.length - 1; i++) {
    if (arr[i] > arr[i + 1]) {
      return false;
    }
  }
  return true;
}
  • Write a TypeScript function to check if a number is prime.
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function isPrime(num: number): boolean {
  if (num <= 1) {
    return false;
  }
  for (let i = 2; i <= Math.sqrt(num); i++) {
    if (num % i === 0) {
      return false;
    }
  }
  return true;
}
  • Write a TypeScript function to find the index of the first occurrence of a number in an array of numbers.
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function findIndexOf(arr: number[], num: number): number {
  return arr.indexOf(num);
}
  • Write a TypeScript function to find the average of an array of numbers.
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function findAverage(arr: number[]): number {
  const sum = arr.reduce((total, num) => total + num, 0);
  return sum / arr.length;
}
  • Write a TypeScript function to convert a string to an array of characters.
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function stringToCharArray(str: string): string[] {
  return str.split("");
}
  • Write a TypeScript function to reverse an array of numbers.
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function reverseArray(arr: number[]): number[] {
  return arr.reverse();
}
  • Write a TypeScript function to check if an array of numbers contains a specific number.
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function containsNumber(arr: number[], num: number): boolean {
  return arr.includes(num);
}

  • Write a TypeScript function to convert an array of strings to a single string, separated by a given delimiter.
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function joinStrings(arr: string[], delimiter: string): string {
  return arr.join(delimiter);
}
  • Write a TypeScript function to calculate the sum of an array of numbers using recursion.
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function sum(arr: number[]): number {
  if (arr.length === 0) {
    return 0;
  }
  const [first, ...rest] = arr;
  return first + sum(rest);
}
  • Write a TypeScript function to find the intersection of two arrays of numbers.
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function findIntersection(arr1: number[], arr2: number[]): number[] {
  return arr1.filter((num) => arr2.includes(num));
}
  • Write a TypeScript function to check if a number is even.
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function isEven(num: number): boolean {
  return num % 2 === 0;
}
  • Write a TypeScript function to check if a string is a valid email address.
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function isValidEmail(email: string): boolean {
  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  return emailRegex.test(email);
}
  • Write a TypeScript function to check if an array of numbers is sorted in descending order.
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function isSortedDescending(arr: number[]): boolean {
  for (let i = 0; i < arr.length - 1; i++) {
    if (arr[i] < arr[i + 1]) {
      return false;
    }
  }
  return true;
}
  • Write a TypeScript function to find the difference between two arrays of numbers.
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function findDifference(arr1: number[], arr2: number[]): number[] {
  return arr1.filter((num) => !arr2.includes(num));
}
  • Write a TypeScript function to check if a string is a valid URL.
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function isValidUrl(url: string): boolean {
  const urlRegex = /^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/;
  return urlRegex.test(url);
}
  • Write a TypeScript function to calculate the factorial of a number using recursion.
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function factorialRecursive(num: number): number {
  if (num <= 1) {
    return 1;
  }
  return num * factorialRecursive(num - 1);
}
  • Write a TypeScript function to remove an item from an array by index.
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function removeByIndex(arr: any[], index: number): any[] {
  return [...arr.slice(0, index), ...arr.slice(index + 1)];
}
  • Write a TypeScript function to convert an array of objects to a single object, using a specified property as the key.
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function arrayToMap(arr: any[], key: string): { [key: string]: any } {
  return arr.reduce((map, obj) => {
    map[obj[key]] = obj;
    return map;
  }, {});
}
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