From e6fea6f0509d2f2df805e9c4b4e364a1d7023db9 Mon Sep 17 00:00:00 2001
From: Brian Wendt <bwendt@choosemylo.com>
Date: Fri, 7 Sep 2018 00:19:45 -0500
Subject: [PATCH] Create Arrays w/ Numeric keys (#9)
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* Add array creation support; Add UMD support

* Update readme.md

* Reverting build tool change

* revert `dist` changes

* 🏌️‍♂️⛳️

* update test syntax

* revert version change

* update readme docs

* update bytesize
---
 package.json  |  2 +-
 readme.md     | 10 ++++++++--
 src/index.js  |  2 +-
 test/index.js |  3 +++
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/package.json b/package.json
index 63c3fcd..a083fbc 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "dset",
   "version": "1.0.1",
   "repository": "lukeed/dset",
-  "description": "A tiny (135B) utility for safely writing deep Object values~!",
+  "description": "A tiny (144B) utility for safely writing deep Object values~!",
   "module": "dist/dset.es.js",
   "main": "dist/dset.js",
   "license": "MIT",
diff --git a/readme.md b/readme.md
index ce88ef7..ba21921 100644
--- a/readme.md
+++ b/readme.md
@@ -1,6 +1,6 @@
 # dset [![Build Status](https://travis-ci.org/lukeed/dset.svg?branch=master)](https://travis-ci.org/lukeed/dset)
 
-> A tiny (135B) utility for safely writing deep Object values~!
+> A tiny (144B) utility for safely writing deep Object values~!
 
 This module exposes two module definitions:
 
@@ -24,6 +24,7 @@ const dset = require('dset');
 let foo = { a:1, b:2 };
 let bar = { foo:123, bar:[4, 5, 6], baz:{} };
 let baz = { a:1, b:{ x:{ y:{ z:999 } } }, c:3 };
+let qux = { };
 
 dset(foo, 'd.e.f', 'hello');
 // or ~> dset(foo, ['d', 'e', 'f'], 'hello');
@@ -39,6 +40,11 @@ dset(baz, 'b.x.j.k', 'mundo');
 dset(baz, 'b.x.y.z', 'hola');
 console.log(baz);
 //=> { a:1, b:{ x:{ y:{ z:'hola' }, j:{ k:'mundo' } } }, c:3 }
+
+dset(qux, 'a.0.b.0', 1);
+dset(qux, 'a.0.b.1', 2);
+console.log(qux);
+//=> { a: [{ b: [1, 2] }] }
 ```
 
 ## API
@@ -61,7 +67,7 @@ The key path that should receive the value. May be in `x.y.z` or `['x', 'y', 'z'
 
 > **Note:** Please be aware that only the _last_ key actually receives the value!
 
-> **Important:** New Objects are created at each segment if there is not an existing structure.
+> **Important:** New Objects are created at each segment if there is not an existing structure.<br>When numerical-types are encounted, Arrays are created instead!
 
 #### value
 
diff --git a/src/index.js b/src/index.js
index 5a9c911..e46f5b4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -3,6 +3,6 @@ export default function (obj, keys, val) {
 	var i=0, l=keys.length, t=obj, x;
 	for (; i < l; ++i) {
 		x = t[keys[i]];
-		t = t[keys[i]] = (i === l - 1 ? val : (x == null ? {} : x));
+		t = t[keys[i]] = (i === l - 1 ? val : (x == null ? (+keys[i + 1] > -1 ? [] : {}) : x));
 	}
 }
diff --git a/test/index.js b/test/index.js
index ec9d2bd..13fffdd 100644
--- a/test/index.js
+++ b/test/index.js
@@ -16,6 +16,9 @@ test('dset', t => {
 	fn(foo, ['d', 'a', 'b'], 123); // change via array
 	t.is(foo.d.a.b, 123, 'mutates; changes the value via array-type keys');
 
+	fn(foo, 'e.0.0', 1); // create arrays instead of objects
+	t.is(foo.e[0][0], 1, 'mutates; can create arrays via flag and when next key is numeric');
+
 	fn(foo, 'd.a.x.y', 456); // preserve existing structure
 	t.same(foo.d, { a:{ b:123, x:{y:456} }}, 'mutates; writes into/preserves existing object');