CasperJS : check if params are correctly set

casper.checkParams.js

/**
 * Check if the params exist
 *
 * @param array $params
 *
 * @return bool
 */
function checkParams($params) {
    $params.forEach(function(param){
        if(typeof casper.cli.options[param] == 'undefined') {
            casper.echo('`' + param + '` not define (Use --' + param + ')');
            casper.exit();
        }
    });
}

checkParams(['url', 'login', 'password']);