Ignore keys with undefined vals in pick and zipObj

README.md

@@ -9,7 +9,7 @@
 <p align="center">
   <a href="https://www.npmjs.com/package/tinyfunk"><img src="https://img.shields.io/npm/v/tinyfunk.svg" alt="npm version" style="max-width:100%;"></a>
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-  <a href="#"><img src="https://img.shields.io/badge/gzip--size-1.55%20kB-blue.svg" alt="gzip-size" style="max-width:100%;"></a>
+  <a href="#"><img src="https://img.shields.io/badge/gzip--size-1.56%20kB-blue.svg" alt="gzip-size" style="max-width:100%;"></a>
   <br />
   <a href="https://travis-ci.org/flintinatux/tinyfunk"><img src="https://travis-ci.org/flintinatux/tinyfunk.svg?branch=master" alt="Build Status" style="max-width:100%;"></a>
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src.js

@@ -352,7 +352,8 @@ const when = curry((pred, f, x) =>
 // zipObj :: [k] -> [v] -> { k: v }
 const zipObj = curry((keys, vals) => {
   const res = {}
-  for (let i = length(keys); i--;) res[keys[i]] = vals[i]
+  for (let i = length(keys); i--;)
+    if (vals[i] !== undefined) res[keys[i]] = vals[i]
   return res
 })
 

test/pick.js

@@ -12,4 +12,8 @@ describe('pick', () => {
   it('is curried', () =>
     expect(pick([ 'a', 'b' ])(orig)).to.eql({ a: 'a', b: 'b' })
   )
+
+  it('does not include a picked key if val is undefined', () =>
+    expect(pick([ 'a', 'd' ], orig)).to.eql({ a: 'a' })
+  )
 })

test/zipObj.js

@@ -13,4 +13,8 @@ describe('zipObj', () => {
   it('is curried', () =>
     expect(zipObj(keys)(vals)).to.eql({ foo: 1, bar: 2 })
   )
+
+  it('does not include a key when val is undefined', () =>
+    expect(zipObj(keys, [ 1, undefined ])).to.eql({ foo: 1 })
+  )
 })