JAVASCRIPT: (Feel free to test me on concepts shown below even during my sleep)

Array of numbers and returns the sum of all the numbers in the array:

​function sumArray(numbers) {
  var sum = 0;
  for (var i = 0; i < numbers.length; i++) {
    sum += numbers[i];
  }
  return sum;
}

// Example usage:
var numbers = [1, 2, 3, 4, 5];
var sum = sumArray(numbers);
console.log(sum); // Output: 15


Function that takes a string and returns a reversed version of the string:

function reverseString(string) {
  var reversedString = "";
  for (var i = string.length - 1; i >= 0; i--) {
    reversedString += string[i];
  }
  return reversedString;
}

// Example usage:
var string = "Hello, world!";
var reversedString = reverseString(string);
console.log(reversedString); // Output: "!dlrow ,olleH"



Takes a number and returns a Boolean value indicating whether the number is prime:
function swapObjectKeysAndValues(object) {
  var newObject = {};
  for (var key in object) {
    newObject[object[key]] = key;
  }
  return newObject;
}

// Example usage:
var object = {
  name: "John Doe",
  age: 30,
  occupation: "Software Engineer"
};
var newObject = swapObjectKeysAndValues(object);
console.log(newObject); // Output: { "Software Engineer": "occupation", "30": "age", "John Doe": "name" }


Function that takes a string and returns a new string with all the vowels removed:
function removeVowels(string) {
  var vowels = ["a", "e", "i", "o", "u"];
  var newString = "";
  for (var i = 0; i < string.length; i++) {
    if (!vowels.includes(string[i])) {
      newString += string[i];
    }
  }
  return newString;
}

// Example usage:
var string = "Hello, world!";
var newString = removeVowels(string);
console.log(newString); // Output: "Hll, wrld!"



Function that takes an object and returns a new object with all the keys and values swapped
function swapObjectKeysAndValues(object) {
  var newObject = {};
  for (var key in object) {
    newObject[object[key]] = key;
  }
  return newObject;
}

// Example usage:
var object = {
  name: "John Doe",
  age: 30,
  occupation: "Software Engineer"
};
var newObject = swapObjectKeysAndValues(object);
console.log(newObject); // Output: { "Software Engineer": "occupation", "30": "age", "John Doe": "name" }


Notes for myself:

-> Javascript unlike HTML, CSS is almost like a programing language which allows for logic statements like if, else, etc. 
-> So many use cases like Tablet, Mobile, Laptop, 
-> Ionicframework.com - it has many frameworks built in for mobile applications like sliders, buttons, alert, etc. It has Angular (for dynamism), VUE (for human Input), React(), 
-> Browsers have entire javascript built into it. However, that's not the case with node js, angular js, 
-> Javascript can dynamically modify any element on the webpage with an ID (it could be table, slider, header, etc) and later define that ID.
-> A good programmer is the one who takes care of the time-space complexity. Meaning, who makes the phone/computer least amount of efforts (least number of computations or least expensive computations) is a better programmer. 
-> Python is an interpreted language. 
-> Primary Domain -> VisualStudio.com and subdomain code.visualstudio.com
-> By default the web server looks for index.html file or home.html file when we try to open a website.
->Github to code collaboration environment. 
-> Virtual environment is a localized environment is not portable and it requires an operating system. 
-> Docker is portable and does not require an operating system to work and for its resources.