JavaScript Strings: Uppercase, Lowercase and Capitalization

gistfile1.txt

// uppercase
var sourceText = "To see a World in a Grain of Sand";
console.log(sourceText.toUpperCase());
> TO SEE A WORLD IN A GRAIN OF SAND

// lowercase
var sourceText = "And a Heaven in a Wild Flower";
sourceText = sourceText.toLowerCase();
console.log(sourceText);
> and a heaven in a wild flower

// Capitalisation >>> h1 { text-transform: capitalize; }
// This is the broadest function, correctly transforming letters with diacritics and characters after hyphens. 
function toTitleCase(str) {
    return str.replace(/[^-'\s]+/g, function(word) {
        return word.replace(/^./, function(first) {
        return first.toUpperCase();
        });
    });
}

var concertTitle = "live-alive in łódź";
console.log(toTitleCase(concertTitle));
> Live-Alive In Łódź

// Capitalising the first letter of the first word >>> p:first-letter { text-transform: uppercase; }
String.prototype.toSentenceCase = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
}

var auguries = "hold infinity in the palm of your hand";
console.log(auguries.toSentenceCase());
> Hold infinity in the palm of your hand