javascript - Nested for-loop overwrites object attribute -


i broke down code simplified jsfiddle. problem attribute is set 1 object in end every object gets value of last iteration (in case false id05 should true). why it? overlook something?

jsfiddle (see in console)

var reminder = {     id0: {         id: 0,         medid: 0     } };  var chart = {     id0: {         medid: 0,         values: [[5,1]]     } } var tmp = {};  for(var = 0; < 10; i++) {     (id in reminder) {         tmp[id + i] = reminder[id];         tmp[id + i].is = false;          for(var j = 0; j < chart["id" + reminder[id].medid].values.length; j++) {             if (chart["id" + reminder[id].medid].values[j][0] === i) {                 tmp[id + i].is = true;             }         }     } }

tmp[id + i] = reminder[id]; copy reference object , not clone object itself.

consider this: 

var = { a: [] };  var b = a.a;  b.push(1); console.log(a.a); // [1]

this means objects same , share same properties (tmp.id05 === tmp.id06 etc...)

tmp.id00.__my_secret_value__ = 1234; console.log(tmp.id09.__my_secret_value__); // 1234

to clone objects in javascript can use object.create make shallow clone (only clone top level properties)


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