pick
Return partial copy of object containing specified subset of keys.
Installation
$ npm install @f/pick
Usage
var pick = require('@f/pick')
var source = {a: 1, b: 2, c: 3, d: function () {}}
var src1 = {a: 2}
var src2 = {a: 1, b: 2}
pick(['a', 'c'], source) // => {a: 1, c: 3}
pick('a', source) // => {a: 1}
pick(isFunction, source) // => {d: function () {}}
pick(['a', 'b'], src1, src2) // => {a: 2, b: 2}API
pick(keys, ...objs)
-
keys- Key(s) to pick, or predicate function that receives(val, key). -
...objs- Source objects to pick from, the object in the leftmost position has the highest priority. Multiple objects do not work with predicate functions.
Returns: partial copy of obj
Progressive picking
This pick implementation has a somewhat unique feature - it can pick progressively from objects until the key is found. If you pass multiple objects it will, starting from the left hand side, use the first value in the list that is not undefined. E.g.
var src1 = {a: 2}
var src2 = {a: 1, b: 2}
pick(['a', 'b'], src1, src2) // => {a: 2, b: 2}License
MIT