JAVASCRIPT

lowercase or uppercase all strings in array javascript

const names = ['Ali', 'Atta', 'Alex', 'John'];

const lowercased = names.map(name => name.toLowerCase());

console.log(lowercased);
// ['ali', 'atta', 'alex', 'john']

const uppercased = names.map(name => name.toUpperCase());

console.log(uppercased);
// ['ALI', 'ATTA', 'ALEX', 'JOHN']

how to convert array to uppercase in javascript

var a = ['this','is','test'];

a.map(f=>{ return f.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

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!

js sort strings lowercase and uppercase

["Foo", "bar"].sort(Intl.Collator().compare); //["bar", "Foo"]