Convert string to title case with JavaScript

Question

Is there a simple way to convert a string to title case? E.g. john smith becomes John Smith. I\'m not looking for something complicated like John R

Answer 1

My one line solution:

String.prototype.capitalizeWords = function() {
    return this.split(" ").map(function(ele){ return ele[0].toUpperCase() + ele.slice(1).toLowerCase();}).join(" ");
};

Then, you can call the method capitalizeWords() on any string. For example:

var myS = "this actually works!";
myS.capitalizeWords();

>>> This Actually Works

My other solution:

function capitalizeFirstLetter(word) {
    return word[0].toUpperCase() + word.slice(1).toLowerCase();
}
String.prototype.capitalizeAllWords = function() {
    var arr = this.split(" ");
    for(var i = 0; i < arr.length; i++) {
        arr[i] = capitalizeFirstLetter(arr[i]);
    }
    return arr.join(" ");
};

Then, you can call the method capitalizeWords() on any string. For example:

var myStr = "this one works too!";
myStr.capitalizeWords();

>>> This One Works Too

Alternative solution based on Greg Dean answer:

function capitalizeFirstLetter(word) {
    return word[0].toUpperCase() + word.slice(1).toLowerCase();
}
String.prototype.capitalizeWords = function() {
    return this.replace(/\w\S*/g, capitalizeFirstLetter);
};

Then, you can call the method capitalizeWords() on any string. For example:

var myString = "yes and no";
myString.capitalizeWords()

>>> Yes And No