New functions- omit, pick, pickOrDefault, pickBy

[singla-shivam]

Is your feature request related to a problem? Please describe.
NA

Describe the solution you'd like
Need to have some more functions. These functions operate on an object (functor) and return a new object.

1. Omit- This function will take a list of keys (strings) and will return new object with those list of keys not included in the objects.

Fae.omit(['a', 'd'], { a: 1, b: 2, c: 3, d: 4 });  // { b: 2, c: 3 }

2. Pick- This function will take a list of keys (strings) and will return new object with including those keys only which are in given list of keys.

Fae.pick(['a', 'd', 'e'], { a: 1, b: 2, c: 3, d: 4 }); // { a: 1, d: 4 }

3. PickOrDefault- This function will take a list of keys (strings) and will return new object with including those keys only which are in given list of keys, and assign a value calculated by given default function if the corresponding key doesn't exist on the object.

Fae.pickOrDefault(['a', 'c'], (key: string) => key + '-default', { a: 1, b: 3 }) //  { a: 2, c: 'c-default' }
Fae.pickOrDefault(['a', 'c', 'd'], Fae.always(4), { a: 1, b: 3 }) //  { a: 2, c: 4, d: 4 }

4. PickBy- This function will take a predicate function, and will return a new object including keys which satisfy the predicate function.

Fae.pickBy((key: string) => k.length >= 2, { a: 1, bc: 2, def: 3 }) // { bc: 2, def: 3 }

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[neelra8n]

assign me , and help me understand this issue

[singla-shivam]

Sure @neelra8n