Clone or copy a method in an object (Javascript)

Question

Suppose I have an object A:

var A = { 'parameter': "Dura lex sed lex.", 'function_a': function (new_type) { console.log ("It's working!"); } };

Then, suppose I also an object B:

var B = { 'parameter': "Veni vidi vici!" };

What I need is a simple way to dynamically create a method function_b() inside the object B without copy/clone the parameter, of the object A, ("Dura lex sed lex.") in the object B and to preserve the parameter ("Veni vidi vici!") of the object B.

How can I do it?

_proto ? property.

Arpit Solanki
– Arpit Solanki

2017-06-12 18:57:02 +00:00
Commented Jun 12, 2017 at 18:57 — Arpit Solanki
– Arpit Solanki, Commented Jun 12, 2017 at 18:57
@ArpitSolanki No

Bergi
– Bergi

2017-06-12 19:01:20 +00:00
Commented Jun 12, 2017 at 19:01 — Bergi
– Bergi, Commented Jun 12, 2017 at 19:01
Just assign B.function_b = A.function_a;?

Bergi
– Bergi

2017-06-12 19:01:31 +00:00
Commented Jun 12, 2017 at 19:01 — Bergi
– Bergi, Commented Jun 12, 2017 at 19:01
"Vini vidi vici!" is not what Caesar said... It's "veni" :)

PeterMader
– PeterMader

2017-06-12 19:13:39 +00:00
Commented Jun 12, 2017 at 19:13 — PeterMader
– PeterMader, Commented Jun 12, 2017 at 19:13

sergioBertolazzo · Accepted Answer · 2017-06-12 19:00:14Z

3

try it:

B['function_b'] = A['function_a'];

answered Jun 12, 2017 at 19:00

sergioBertolazzo

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1 Comment

Badacadabra Over a year ago

While this code may answer the question, providing additional context regarding how and/or why it solves the problem would improve the answer's long-term value.

DontVoteMeDown · Accepted Answer · 2017-06-12 19:00:39Z

2

You mean something like this?

var A = { 'parameter': "Dura lex sed lex.", 'function_a': function (new_type) { console.log ("It's working!"); } }; var B = { 'parameter': "Vini vidi vici!" }; var clone = function(origin, target, prefix) { Object.keys(origin).forEach(function(key) { if (!target.hasOwnProperty(key)) { if (key.indexOf("function_") > -1) { target["function_" + prefix] = origin[key]; } } }); } clone(A, B, "b"); console.log(B); B.function_b();

answered Jun 12, 2017 at 19:00

DontVoteMeDown

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6 Comments

Bergi Over a year ago

Much too complicated. And that hasOwnProperty check is good for nothing.

DontVoteMeDown Over a year ago

@Bergi I supose OP wants a dynamic function, not a hard code snippet.

DontVoteMeDown Over a year ago

@Bergi also, he wants to preserve the duplicated keys, that is why I added hasOwnProperty.

Bergi Over a year ago

We don't know. Better post a comment to ask for clarification instead of a guess at an answer.

SphynxTech Over a year ago

Is it possible to do the same thing easier and more quickly?

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Waldir J. Pereira Junior · Accepted Answer · 2017-06-12 19:01:06Z

I don't know if I understood your question, but I think you want something like this:

B.function_b = function(whatever) { console.log('it works!'); };

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