Converts a string to camel case.
string to convert
a camel-cased string
var str = camelcase( 'Hello World!' ); // returns 'helloWorld'
var str = camelcase( 'foo_bar' ); // returns 'fooBar'
var str = camelcase( 'foo-bar' ); // returns 'fooBar'
Converts a string to camel case.