How to make first character uppercase of all words in JavaScript?

Question

I have searched for solution but did not find yet.

I have the following string.

1. hello
2. HELLO
3. hello_world
4. HELLO_WORLD
5. Hello World

I want to convert them to following:

1. Hello
2. Hello
3. HelloWorld
4. HelloWorld
5. HelloWorld

If there is No space and underscore in string just uppercase first and all others to lowercase. If words are separated by underscore or space then Uppercase first letter of each word and remove space and underscore. How can I do this in JavaScript.

Thanks

Answer 1

You could do something like this:

function toPascalCase(str) {
    var arr = str.split(/\s|_/);
    for(var i=0,l=arr.length; i<l; i++) {
        arr[i] = arr[i].substr(0,1).toUpperCase() + 
                 (arr[i].length > 1 ? arr[i].substr(1).toLowerCase() : "");
    }
    return arr.join("");
}

You can test it out here, the approach is pretty simple, .split() the string into an array when finding either whitespace or an underscore. Then loop through the array, upper-casing the first letter, lower-casing the rest...then take that array of title-case words and .join() it together into one string again.