implement build-in id() function (example included)

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#723 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
52/100
Issue type
Feature
Clarity
Clearly specified
Activity status
Stale
Tech stack
javascript, python
Domain
compilers

Research direction

Start in builtin.js and compare the requested implementation with how other Python built-ins are exposed by Transcrypt. Verify the resulting built-in assigns stable identifiers to objects and behaves like Python's id() for supported inputs; the issue does not name a test file, so inspect the existing built-in test coverage before adding or running relevant checks.

Written by the indexing model from the issue text.

Description

STATE: under consideration

Python function id() is very useful and it is trivial to implement using WeakMap, all you need to is is adding to __builtin__.js this code:

var _id_registry = new WeakMap();
var _id_counter = 0;

export function id(obj) {
    var id = _id_registry.get(obj);
    if (id === undefined) {
        id = ++_id_counter;
        _id_registry.set(obj, id);
    }
    return id;
}
Dominant language
Python
Stars
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Forks
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