JAVASCRIPT

uppercase and lowercase letters in js

str.toLowerCase()
str.toUpperCase()

js to uppercase

const string = "A string";

const upperCase = string.toUpperCase();
console.log(upperCase); // -> A STRING

const lowerCase = string.toLowerCase();
console.log(lowerCase); // -> a string

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

convert an array to uppercase or lowercase js

var fruits = ["Banana", "Orange", "Apple", "Mango"];
undefined
string = fruits.join(' ').toUpperCase();
// Output"BANANA ORANGE APPLE MANGO"

javascript function uppercase to lowercase

let myGreeting = 'Hey there!';

console.log(myGreeting.toLowerCase());

//output
//hey there!

how to convert string to uppercase in javascript

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

javascript uppercase function

const str = "This is a very long string!";

// This will return => "THIS IS A VERY LONG STRING!"
console.log(str.toUpperCase());