.replace()

Returns a new string with one, some, or all matches of a pattern replaced by a replacement

• If pattern is a string, only the first occurrence will be replaced.
• The original string is left unchanged.

const paragraph = "I think Ruth's dog is cuter than your dog!";

console.log(paragraph.replace("Ruth's", 'my'));
// Expected output: "I think my dog is cuter than your dog!"

const regex = /Dog/i;

console.log(paragraph.replace(regex, 'ferret'));
// Expected output: "I think Ruth's ferret is cuter than your dog!"

.replaceAll()

Returns a new string with all matches of a pattern replaced by a replacement

• The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match.
• The original string is left unchanged.

const paragraph = "I think Ruth's dog is cuter than your dog!";

console.log(paragraph.replaceAll('dog', 'monkey'));
// Expected output: "I think Ruth's monkey is cuter than your monkey!"

// Global flag required when calling replaceAll with regex
const regex = /Dog/gi;
console.log(paragraph.replaceAll(regex, 'ferret'));
// Expected output: "I think Ruth's ferret is cuter than your ferret!"