我正在尝试es6地图数据结构,但是当我试图迭代地图时,它给出了以下错误
The error occurs on line 6:
for (let [key, val] of m.entries())
SyntaxError: Unexpected token [
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:413:25)
at Object.Module._extensions..js (module.js:452:10)
at Module.load (mod
我有大约40个TextFormFields,我用TextEditingController检索它们的值。通过以下步骤将这些值转换为Map<String、String>映射:
// map that stores controllers
Map<String, TextEditingController> storeControllers = controllers;
// convert to map that stores only controller texts
Map<String, String> currentSelections = stor
基本上,我有以下代码:
Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "test");
map.put(2, "test2");
// I can get the string using this:
String str = map.get("test2");
// but how do I get the index ('key') of "test2"?
代码几乎是不言自明的。我怎么得到
为什么Map<String,List<?>>不能使用Map<String,List<SomeBean>>可转换
我现在要做的是:
Map<String, List<SomeBean>> fromMap = new LinkedHashMap<String, List<SomeBean>>();
/* filling in data to fromMap here */
Map<String,List<?>> toMap = new LinkedHashMap<Str
<h3>My Google Maps Demo</h3>
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"
我正在尝试将Azure地图添加到一个简单的Angular应用程序中。
我得到了下面的错误。你知道为什么会发生这种情况吗?我该怎么解决呢?
atlas.min.js:2509 Error: AuthenticationManager finished initializing, but no token is available
at atlas.min.js:2509
at ZoneDelegate.invoke (zone-evergreen.js:365)
at Object.onInvoke (core.js:40794)
at ZoneDelegate.