Various Underscore/CamelCase methods.

underscore_camelcase.js

function underscoreToCamelCase(value) {
    return value.split('_').map(function(value) { return value.charAt(0).toUpperCase() + value.substr(1); }).join('');
}

underscore_camelcase.php

function underscoreToCamelCase($value) {
    return implode(array_map(function($value) { return ucfirst($value); }, explode('_', $value)));
}

function camelCaseToUnderscore($value) {
    return preg_replace_callback('/([A-Z])/', function($char) { return '_'.strtolower($char[1]); }, lcfirst($value));
}

underscore_camelcase.py

def underscoreToCamelCase(value):
    return ''.join([value[0].upper() + value[1:] for value in value.split('_')])

underscore_camelcase.rb

def underscore_to_camelcase(value)
  value.split('_').map(&:capitalize).join
end