How to change a String's Case in JavaScript

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Strings can be capitalized using String.toUpperCase
For instance;

const str = 'John swana'

str.toUpperCase()

// 'JOHN SWANA'
String.toLowerCase turns strings to their small letters or 'lowerCase'


const strr = "Lorem ipsum"
strr.toLowerCase()

// lorem ipsum
Numbers are not converted, they remain constant, untouched and unchanged.


'65'.toLowerCase()

// '65'

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