Title case a sentence?

Question

I\'m trying to proper case a string in javascript - so far I have this code: This doesn\'t seem to capitalize the first letter, and I\'m also stuck on how to lowercase all the l

Answer 1

One of the cleanest ways I can come up with, using ES6, while still lacking a proper .capitalize() string prototype method:

let sent = "these are just some words on paper"
sent.split(' ').map ( ([h, ...t]) => h.toUpperCase() + t.join('').toLowerCase() )

Uses destructuring on array element strings to obtain head and tail via spread operator (making tail a sequence of characters) which are first joined before coerced to lower case. Or you could replace that with a s => s[0].toUpperCase() + s.substring(1).toLowerCase() I guess. Oh, since the question seems to indicate ES5, transformation is cheap although noticeably more verbose:

function capitalize (sentence) {
    return sentence.split(' ').map(
        function (s) {
            return s[0].toUpperCase() + s.substring(1).toLowerCase()      
        }).join(' ') ;
}

That is, assuming you'd want another sentence returned.