nested

How to implement nested Routing (child routes) in react router v4?

由 只谈情不闲聊 提交于 2019-12-13 08:03:35
问题 The component tree i want is as below - Login - Home - Contact - About Contact and About are children of Home. This is my App.js , class App extends Component { render() { return ( <BrowserRouter> <div> <Route exact path="/home" component={HomeView} /> </div> </BrowserRouter> ); } } render(<App />, document.getElementById('root')); This is Home, export const HomeView = ({match}) => { return( <div> <NavBar /> Here i want to render the contact component, (Navbar need to stay) </div> ) } This is

Are nested classes inside an interface implicitly static and final?

由 耗尽温柔 提交于 2019-12-13 07:25:23
问题 All variables inside of interface are public static and final. So if I declare a nested class inside an interface will it also become static and final? Interface I { class c { static void m(){ } } } 回答1: Lets find out. Lets create structure like: interface Interface{ class Foo{} } Now we can test: System.out.println("static: " + Modifier.isStatic(Interface.Foo.class.getModifiers())); System.out.println("final: " + Modifier.isFinal(Interface.Foo.class.getModifiers())); which prints: static:

Ruby return top level hash key if value recursively contains string

由 僤鯓⒐⒋嵵緔 提交于 2019-12-13 07:08:49
问题 I have the data structure below and I am trying to return the top level key (lo, eth0 or eth1) if anywhere recursively and arbitrarily deep within it's value is a given string. Then terminate the search after the first instance of the string is found. Find key/value pairs deep inside a hash containing an arbitrary number of nested hashes and arrays This is sort of similar to what I'm trying to do but I haven't been able to map it to my own problem h.find{ |k,v| break k if v.include? "number"

UPDATE NESTED CASE

由 梦想与她 提交于 2019-12-13 06:59:41
问题 I am using TOAD which connects to Oracle 11g. I am working on parsing an address field, which will contain building number, street name, street type, direction, sub-unit, and Civic Number Suffix Type. Because of the complexity in how address's are allowed to be entered and still be valid (or just having incorrect information which Im ignoring for now) I am having to do some very specific regular expressions to break apart the building number, sub-unit, and Civic Number Suffix Type. I have

How can I access and process nested objects, arrays or JSON?

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-13 06:58:42
问题 I have a nested data structure containing objects and arrays. How can I extract the information, i.e. access a specific or multiple values (or keys)? For example: var data = { code: 42, items: [{ id: 1, name: 'foo' }, { id: 2, name: 'bar' }] }; How could I access the name of the second item in items ? 回答1: Preliminaries JavaScript has only one data type which can contain multiple values: Object . An Array is a special form of object. (Plain) Objects have the form {key: value, key: value, ...}

how to print all frames inside frameset/nested frameset with javascript

由 蹲街弑〆低调 提交于 2019-12-13 06:51:13
问题 I have a nested frameset and i what to print all frames with one print button, i searched and tried many solutions which mentioned, but still I have problem with the IE 11. any one can help me please. my code is here. ---main page <html> <frameset rows="10%,*"> <frame name="top_frame" src="top-frame.htm" frameborder="1" noresize="0" scrolling="no"> <frameset cols="20%,*"> <frame name="left_frame" src="left-frame.htm" frameborder="0" noresize="0" scrolling="no"> <frame name="right_frame" src=

Concatenate items in two nested lists to pairs in tuples

由 人走茶凉 提交于 2019-12-13 06:24:41
问题 I have two nested lists: ls1 = [["a","b"], ["c","d"]] ls2 = [["e","f"], ["g","h"]] and I'd like the following result [(a,e), (b,f), (c,g), (d,h)] I've tried zip(a,b), how do I zip nested lists into a list with tupled pairs? 回答1: You can also use itertools.chain.from_iterable and zip : >>> ls1 = [["a","b"], ["c","d"]] >>> ls2 = [["e","f"], ["g","h"]] >>> >>> zip(itertools.chain.from_iterable(ls1), itertools.chain.from_iterable(ls2)) [('a', 'e'), ('b', 'f'), ('c', 'g'), ('d', 'h')] 回答2: You

C++ incomplete type is not allowed class inner use?

由 醉酒当歌 提交于 2019-12-13 06:09:47
问题 I have a header Room.h defined as follows: #ifndef ROOM_H #define ROOM_H class Room { public: Room(); private: Room north; Room south; Room east; Room west; }; #endif But I get Error: incomplete type is not allowed for each of the Room variables. Is there a fundamental flaw in this kind of design? 回答1: Short Answer Use pointer. private: Room* north; ... Long Answer C++ compiler need know size of Class. Error: incomplete type is not allowed , because cannot compute size. Use pointer. Because

Ruby on Rails: nested each loop within while loop generates error

由 那年仲夏 提交于 2019-12-13 06:01:56
问题 I get a syntax error, when I execute the following code within the rails console: "syntax error, unexpected $end, expecting keyword_end" range = 2 my_array = Array.new(range) a = [1] i = 0 while i < range do a.each do |b| puts "test" end i += 1 end Does anyone know what I am doing wrong? The strange thing is, that the code is working on my server within a ruby file. Thanks a lot! tuxware 回答1: If you're executing it in IRB, it's likely that, as Beerlington said, it's linebreak issues. It'd

Querying a column with lists in it

由 …衆ロ難τιáo~ 提交于 2019-12-13 04:58:24
问题 I have a dataframe with columns with lists in them. How can I query these? >>> df1.shape (1812871, 7) >>> df1.dtypes CHROM object POS int32 ID object REF object ALT object QUAL int8 FILTER object dtype: object >>> df1.head() CHROM POS ID REF ALT QUAL FILTER 0 20 60343 rs527639301 G [A] 100 [PASS] 1 20 60419 rs538242240 A [G] 100 [PASS] 2 20 60479 rs149529999 C [T] 100 [PASS] 3 20 60522 rs150241001 T [TC] 100 [PASS] 4 20 60568 rs533509214 A [C] 100 [PASS] >>> df2 = df1.head(30) >>> df3 = df1
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