Common

Convert a string to title case (capitalize the first letter of each word). toTitleCase

Typescript

function toTitleCase(str: string): string { 
  return str.replace(/\b\w/g, l => l.toUpperCase()); 
} 

Go

  package main

  import (
    "fmt"
    "strings"
  )

  // Function to convert a string to title case
  func toTitleCase(str string) string {
    // Split the string into words
    words := strings.Fields(str)

    // Iterate over each word and capitalize the first letter
    for i, word := range words {
      words[i] = strings.Title(word)
    }

    // Join the words back into a single string
    return strings.Join(words, " ")
  }

  func main() {
    // Example usage
    input := "hello world"
    titleCase := toTitleCase(input)
    fmt.Println(titleCase) // Output: Hello World
  }

A function to check if a given string is a palindrome.

function isPalindrome(str: string): boolean {
    // Remove punctuation and whitespace and convert to lowercase
    const cleanedStr = str.replace(/[^\w]/g, '').toLowerCase();
    // Compare the cleaned string with its reverse
    return cleanedStr === cleanedStr.split('').reverse().join('');
}

// Example usage:
const testString1 = "A man, a plan, a canal, Panama!";
console.log(isPalindrome(testString1)); // Output: true

const testString2 = "racecar";
console.log(isPalindrome(testString2)); // Output: true

const testString3 = "hello";
console.log(isPalindrome(testString3)); // Output: false

Implement a function to reverse a string without using the built-in reverse() method.

function reverseString(str: string): string {
    let reversed = '';
    for (let i = str.length - 1; i >= 0; i--) {
        reversed += str[i];
    }
    return reversed;
}

console.log("reverseString: ", reverseString('hello world'));

Given an array of numbers, write a function to find the largest and smallest numbers in the array.

function findMinMax(arr) { 
  let min = Math.min(...arr); 
  let max = Math.max(...arr); 
  return [min, max]; 

}

console.log(findMinMax([1, 2, 3]));

...to be continue

Reference

https://the-algorithms.com/category/datastructures https://www.keka.com/javascript-coding-interview-questions-and-answers