18 lines
601 B
Markdown
18 lines
601 B
Markdown
### omitBy
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Creates an object composed of the properties the given function returns falsey for. The function is invoked with two arguments: (value, key).
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Use `Object.keys(obj)` and `Array.filter()`to remove the keys for which `fn` returns a truthy value.
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Use `Array.reduce()` to convert the filtered keys back to an object with the corresponding key-value pairs.
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```js
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const omitBy = (obj, fn) =>
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Object.keys(obj)
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.filter(k => !fn(obj[k], k))
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.reduce((acc, key) => ((acc[key] = obj[key]), acc), {});
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```
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```js
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omitBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number'); // { b: '2' }
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```
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