fix: add index args to object iterators

Author: arobson

spec/fauxdash.spec.js

@@ -217,9 +217,9 @@ describe('fauxdash', function () {
     it('should iterate on object key/values', function() {
       const keys = []
       const values = []
-      _.each({a: 1, b: 2, c: 3}, (v, k) => {
+      _.each({a: 1, b: 1, c: 1}, (v, k, i) => {
         keys.push(k)
-        values.push(v)
+        values.push(v + i)
       })
       keys.should.eql(['a','b','c'])
       values.should.eql([1,2,3])
@@ -228,6 +228,9 @@ describe('fauxdash', function () {
     it('should map on object key/values', function() {
       _.map({a: 1, b: 2, c: 3}, (v, k) => `${k}:${v}`)
         .should.eql(['a:1','b:2','c:3'])
+
+      _.map({a: 1, b: 1, c: 1}, (v, k, i) => `${k}:${v+i}`)
+        .should.eql(['a:1','b:2','c:3'])      
     })
 
     it('should reduce on object key/values', function() {
@@ -236,6 +239,9 @@ describe('fauxdash', function () {
       _.reduce({a: 1, b: 2, c: 3}, (acc, v, k) =>
         acc += `${k}=>${v}`
       , '').should.equal('a=>1b=>2c=>3')
+      _.reduce({a: 1, b: 1, c: 1}, (acc, v, k, i) =>
+        acc += `${k}=>${v+i}`
+      , '').should.equal('a=>1b=>2c=>3')
     })
 
     it('should get values from object keys', function () {

src/index.js

@@ -113,7 +113,7 @@ function defaults (target, ...sources) {
 
 function each (obj, iterator) {
   return Object.keys(obj)
-    .forEach(key => iterator(obj[key], key))
+    .forEach((key, i) => iterator(obj[key], key, i))
 }
 
 function exists (x) {
@@ -242,7 +242,7 @@ function lift (asyncFn) {
 }
 
 function map (obj, fn) {
-  return Object.keys(obj).map(k => fn(obj[k], k))
+  return Object.keys(obj).map((k, i) => fn(obj[k], k, i))
 }
 
 function mapCall (method, map) {
@@ -299,8 +299,8 @@ function parseFunction (fn) {
 }
 
 function reduce (obj, fn, acc) {
-  Object.keys(obj).forEach(k => {
-    acc = fn(acc, obj[k], k)
+  Object.keys(obj).forEach((k, i) => {
+    acc = fn(acc, obj[k], k, i)
   })
   return acc
 }