convert snake case(underscore or dash separated) string into camel case

to_camel_case.js

    var SNAKE_CASE_REGEXP = /[_-]([a-z])/g;

    function toCamelCase(str) {
        return String(str)
            .replace(SNAKECASE_REGEXP, function (match, match1) {
                return match1.toUpperCase();
            });
    }