make List return new lists on method calls, add map to array polyfill so that this works, fix runner

3 files changed, 15 insertions, 4 deletions

diff --git a/src/types/ArrayPolyfill.js b/src/types/ArrayPolyfill.js
index 839a970..4d2309f 100644
--- a/src/types/ArrayPolyfill.js
+++ b/src/types/ArrayPolyfill.js
@@ -24,6 +24,12 @@ export const subClassArray = (function () {
       Arr.prototype = Object.create(baseClass.prototype)
       Arr.prototype.constructor = Arr
 
+      Arr.prototype.map = function (fn) {
+        const arr = new Arr()
+        arr.push.apply(arr, Array.prototype.map.call(this, fn))
+        return arr
+      }
+
       return Arr
     }
   }
diff --git a/src/types/List.js b/src/types/List.js
index 193ed05..b50a18e 100644
--- a/src/types/List.js
+++ b/src/types/List.js
@@ -1,7 +1,9 @@
 import { extend } from '../utils/adopter.js'
 import { subClassArray } from './ArrayPolyfill.js'
 
-const List = subClassArray('List', Array, function (arr) {
+const List = subClassArray('List', Array, function (arr = []) {
+  // This catches the case, that native map tries to create an array with new Array(1)
+  if (typeof arr === 'number') return this
   this.length = 0
   this.push(...arr)
 })
@@ -13,9 +15,10 @@ extend(List, {
     if (typeof fnOrMethodName === 'function') {
       this.forEach((el) => { fnOrMethodName.call(el, el) })
     } else {
-      this.forEach((el) => {
-        el[fnOrMethodName](...args)
-      })
+      return this.map(el => { return el[fnOrMethodName](...args) })
+      // this.forEach((el) => {
+      //   el[fnOrMethodName](...args)
+      // })
     }
 
     return this
diff --git a/src/types/SVGArray.js b/src/types/SVGArray.js
index 4fcb500..7f27ec4 100644
--- a/src/types/SVGArray.js
+++ b/src/types/SVGArray.js
@@ -10,6 +10,8 @@ export default SVGArray
 
 extend(SVGArray, {
   init (arr) {
+    // This catches the case, that native map tries to create an array with new Array(1)
+    if (typeof arr === 'number') return this
     this.length = 0
     this.push(...this.parse(arr))
     return this