state

This is how example of my state looks: const INITIAL_STATE = { contents: [ {}, {}, {}, etc.. ], meta: {} } I need to be able and somehow replace an item inside contents array knowing its index, I have tried: return { ...state, contents: [ ...state.contents[action.meta.index], { content_type: 7, content_body: { album_artwork_url: action.payload.data.album.images[1].url, preview_url: action.payload.data.preview_url, title: action.payload.data.name, subtitle: action.payload.data.artists[0].name, spotify_link: action.payload.data.external_urls.spotify } } ] } where action.meta.index is index of

In Python, globals() returns a representation of the global symbol table, while locals() returns a representation of the local state. While both return a dictionary, changes to globals() are effected in the global symbol table, while change to locals() have no effect. Why is this the case? Function locals are highly optimised and determined at compile time, CPython builds on not being able to alter the known locals dynamically at runtime. You can see this when decoding a function bytecode: >>> import dis >>> def foo(): ... a = 'bar' ... return a + 'baz' ... >>> dis.dis(foo) 2 0 LOAD_CONST 1 (

到目前为止我们只学习了一种方法来更新UI。调用 ReactDOM.render( ) 方法来改变输出。 在前面博客中有一个时钟的例子代码： function tick() { const element = ( <div> <h1>Hello, world!</h1> <h2>It is {new Date().toLocaleTimeString()}.</h2> </div> ); ReactDOM.render( element, document.getElementById('root') ); } setInterval(tick, 1000); 将时钟封装为Clock组件 function Clock(props) { return ( <div> <h1>Hello, world!</h1> <h2>It is {props.date.toLocaleTimeString()}.</h2> </div> ); } function tick() { ReactDOM.render( <Clock date={new Date()} />, document.getElementById('root') ); } setInterval(tick, 1000); 1. 将函数转换为类 可以通过5个步骤将 函数组件 转换为 类组件 创建一个名称扩展为 React

I am new to spring so sorry if this is a beginners question, but the manual is not clear (at least not for me) My question is: how do I share state between requests in spring? I can send data from the controller to the view by using a ModelMap, but the data in the ModelMap is not sent back to the next controller by the view. How can I do this with spring? Below is a part of my source code. In the second controller the modelMap doesn't contain the data I stored in the modelMap in the first controller. How am I supposed to maintain state between controllers in spring? thanks a lot for help.