an improved `_.pick` that also validates picked attributes
npm install pedantic-pickpedantic-pick   
=============
This is an enhanced _.pick that runs validation expressions on picked attributes.
It's common for API developers to use underscore or lodash's pick to extract only the
desired attributes of an incoming object when turning it into a JSON blob for storage in a
database or whatever. The problem with that is that additional code is needed to verify
that the attributes are actually the types that you expect them to be.
Using pedantic-pick will allow you to kill two birds with one stone, so to speak.
pick(object, [expressions...], [thisArg])In addition to the standard usage of _.pick
``
pick({name: 'moe', age: 50, userid: 'moe1'}, 'name', 'age')
=> {name: 'moe', age: 50}
...you can do this with pedantic-pick:
pick({name: 'moe', age: 50, userid: 'moe1'}, '!string::name', 'number::age')
=> {name: 'moe', age: 50}
or, of course, use the shorthand form:
pick({name: 'moe', age: 50, userid: 'moe1'}, '!s::name', 'n::age')
=> {name: 'moe', age: 50}
and when something doesn't pass your rules an error is thrown (protip: use try/catch):
pick({name: 'moe', age: 50, userid: 'moe1'}, '!s::name', '!alias')
=> Error: alias failed validation
Validators
The following validators are built-in (and later we'll accept custom validation functions as arguments):* required (prefix the expression with
)
* number (or num or n)
* boolean (or bool or b)
* function (or fun or f)
* object (or o)
* string (or s)
* array (or a)
* nempstring (non-empty string; or nes)
* nemparray (non-empty array; or nea`)