ObjectHasKeys - Check for existence of property in deeply nested object

objHasKeys.js

// Check for existence of property in deeply nested object
function get_if_exist(str) {
    try { return eval(str) }
    catch(e) { return undefined }
}
//slightly slower
function objHasKeys(obj, keys) {
  var next = keys.shift();
  return obj[next] && (! keys.length || objHasKeys(obj[next], keys));
}