case in string

stringTransform.js

// convert space to undersocre (snake case)
string.toLowerCase().split(' ').join('_');

// convert underscore to space
string.split('_').join(' ');

// camelize 
function camelize(str) {
  return str.replace(/(?:^\w|[A-Z]|\b\w|\s+)/g, function(match, index) {
    if (+match === 0) return ""; // or if (/\s+/.test(match)) for white spaces
    return index == 0 ? match.toLowerCase() : match.toUpperCase();
  });
}
// credits : http://stackoverflow.com/questions/2970525/converting-any-string-into-camel-case

// Capitalize 
String.prototype.capitalize = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
}