getown

Lookup an object property only if it's its own property.

API

This module exports one function that holds a method:

getown(obj, prop, fallback)

Returns obj[prop] if obj is truthy and has an own property prop, otherwise returns fallback.

getown.voc(dict, word)

Alias for getown(dict, word, word). Useful to not repeat yourself. Especially useful in case you calculate word on the fly and don't want to evaluate the formula twice.

Usage

from test/usage.mjs:

import getown from 'getown';
const dict = { foo: 'bar' };
same(getown(dict, 'foo'), 'bar');
same(getown(dict, 'bar'), undefined);
same(getown(dict, 'bar', 321), 321);
same(typeof dict.toString, 'function');
same(getown(dict, 'toString'), undefined);

same(getown.voc(dict, 'foo'), 'bar');
same(getown.voc(dict, 'bar'), 'bar');
same(getown.voc(dict, 'qux'), 'qux');

same(getown(null, 'wow'), undefined);
same(getown(null, 'wow', 'doge'), 'doge');

Known issues

• Needs more/better tests and docs.

 

License

ISC