23 lines
647 B
Markdown
23 lines
647 B
Markdown
### Pick
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Use `Objexts.keys()` to convert given object to an iterable arr of keys.
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Use `.filter()` to filter the given arr of keys to the expected arr of picked keys.
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Use `.reduce()` to convert the filtered/picked keys back to a object with the corresponding key:value pair.
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```js
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const pick = (obj, arr) =>
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Object
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.keys(obj)
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.filter((v, i) => arr.indexOf(v) !== -1 )
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.reduce((acc, cur, i) => {
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acc[cur] = obj[cur];
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return acc;
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}, {});
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// const object = { 'a': 1, 'b': '2', 'c': 3 };
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// pick(object, ['a', 'c']) -> { 'a': 1, 'c': 3 }
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// pick(object, ['a', 'c'])['a'] -> 1
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// pick(object, ['a', 'c'])['c'] -> 3
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``` |