Check if a variable is a object and if path key exists.

objectPathExists.js

/**
*   Implementation with pure javascript
*
*   Example:
*
*   var someObject = {a: {b: {c: 1}}};
*
*   objectPathExists(someObject, 'a');       // return true
*   objectPathExists(someObject, 'a.b');     // return true
*   objectPathExists(someObject, 'a.b.c');   // return true
*   objectPathExists(someObject, 'a.b.c.e'); // return false
*/
function objectPathExists (_ob, _path) {
    if (_ob === null || _ob === undefined) return false;
    _path = _path.split('.');
    var count = _path.length, _object = _ob;
    for (var i = 0; i < count; i++) {
        if (Object.keys(_object).length >= 0 && _object.constructor === Object) {
            if ( _object.hasOwnProperty(_path[i]) ) {
                _object = _object[_path[i]]
                if (count-1 == i) return true;
            }
        }
    }
    return false;
}
/**
*   Implementation for prototype
*
*   Example:
*
*   var someObject = {a: {b: {c: 1}}};
*
*   someObject.pathExists('a');          // return true
*   someObject.pathExists('a.b');        // return true
*   someObject.pathExists('a.b.c');      // return true
*   someObject.pathExists('a.b.c.d');    // return false
*/
Object.prototype.pathExists = function (path) {
    return objectKeyExists(this, path);
}