to copy the values from one dictionary to other dictionary in javascript

Question

The following code snippet is unable to copy the contents from one dictionary to other. It is throwing a type error showing "copy.Add is not a function". Can someone suggest the ways to copy the key-value pairs from one dictionary to other.

dict = {"Name":"xyz", "3": "39"};
var copy={};
console.log(dict);
for(var key in dict)
{
   copy.Add(key, dict[key]);
}
console.log(copy);

Answer 1

In Javascript, use Object.assign(copy, dict) to copy contents into another already existing dictionary (i.e. "in-place" copy):

dict = {"Name":"xyz", "3": "39"};
var copy={};
console.log(dict, copy);
Object.assign(copy, dict);
console.log(dict, copy);

In newer JavaScript versions, you can also clone a dict into a new one using the ... operator (this method creates a new instance):

var copy = {...dict};

Extra: You can also combine (merge) two dictionaries using this syntax. Either in-place:

Object.assign(copy, dict1, dict2);

or by creating a new instance:,

var copy = {...dict1, ...dict2};

Answer 2

You won´t need to call add on the copy-variable`. You can directly use the indexer as follows:

dict = {"Name":"xyz", "3": "39"};
var copy = {};
console.log(dict);
for(var key in dict)
{
    copy[key] = dict[key];
}
console.log(copy);