JAVASCRIPT

uppercase and lowercase letters in js

str.toLowerCase()
str.toUpperCase()

lowercase to uppercase in javascript

function changeToUpperCase(founder) {
  return founder.toUpperCase();
}

// calling the function 
const result = changeToUpperCase("Quincy Larson");

// printing the result to the console
console.log(result);

// Output: QUINCY LARSON

javascript function uppercase to lowercase

let myGreeting = 'Hey there!';

console.log(myGreeting.toLowerCase());

//output
//hey there!

javascript capitalize all letters

function capitalizeWords(string) {
   return string.replace(/(?:^|s)S/g, function(a) { return a.toUpperCase(); });
};

how to convert string to uppercase in javascript

const upperCase = (string) => {
  const newText = string.toUpperCase();
  return newText;
};