javascript - how can I get something in Object with a Array? -

i want change value in object,but object nest,like

obj = {   'a': {     'b': {       'c': {         'name': 'bob'       }     }   } } 

and there array:
['a','b','c']
want name array
how can change array obj['a']['b']['c']['name']?
must consider nested object different layers？ how can this?

or in pure javascript :

['a','b','c', 'name' ].reduce(function( t , v ){ return t[v];} , obj) 

el = document.getelementbyid('dbg');  var json = function(val){ return json.stringify(val) };  var log = function(val){el.innerhtml += '<div><pre>' + val + '</pre><div>'}    /****************************************************************/    var obj = {    'a': {      'b': {        'c': {          'name': 'bob'        }      }    }  }      var keypath = ['a','b','c', 'name' ];    var result = keypath.reduce(function( transformed , value){        return transformed[value];      } , obj)    log( 'result\t : ' +  result  )    /***************************************************************/    // can :    var obj2 = {    'a': {      'b': {        'c': {          'name': ['bob' , 'marc' , 'jane' , 'lisa']        }      }    }  }    var keypath2 = 'a.b.c.name.2'    var result2 = keypath2.split('.').reduce(function( transformed , value){        return transformed[value];      } , obj2)    log( 'result2\t : ' + result2 )    /***************************************************************/  // , using in function    var ns = function( keypath , context , splitter){    var _keypath = keypath.split(splitter|| '.');        return _keypath.reduce(function( transformed , value){          return transformed[value];        } , context)      };    var keypath3 = 'a.b.c.name.3';   var result3 = ns( keypath3 , obj2 );    log( 'result3\t : ' + result3)

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