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Pushing to array in React, unexpected behaviour

By : TerryLee
Date : July 29 2020, 01:00 PM
fixed the issue. Will look into that further Your addTodo() looks way too overcomplicated and error prone (you can't rely on array length to get maximum used id, since deleting items, other than last will break the logic).
Besides, it's usually recommended to avoid using arrow notation for class methods.
code :
   const id = Math.max(...this.state.todos.map(({id}) => id),0)+1
   this.setState({todos:[...this.state.todos, {id, content}]})

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ActionScript 3: Unexpected behaviour of array, when pushing an element

By : ivamaddog
Date : March 29 2020, 07:55 AM
This might help you You are setting the argument called id equal to itself, which is clearly not the intended behavior.
When there are instance variables that have the same names as arguments, you need to be explicit about which variable you wish to set:
code :
public function Node(id:int) {
   this.id = id;
public function Node(an_id:int) {
   id = an_id; //here it implicitly assigns the instance variable

React router server side unexpected behaviour

By : sowjanya
Date : March 29 2020, 07:55 AM
may help you . You're returning app.use() inside of app.get() which is what is probably causing your infinite loop. You should be rendering the markup being generated by renderToString() instead:
code :
// render the index template with the embedded React markup
return res.render('index', { markup: markup });

React: Unexpected Behaviour

By : user8016971
Date : March 29 2020, 07:55 AM
Hope that helps Your JSX still isn't right. Please review the JSX syntax with regards to giving it props/children.
You have this:
code :
    cocPersonState = {this.state.showPerson}
    cocperson = {this.state.person.length}
    toggler = {this.togglerPersonHandler}
    cocPersonState = {this.state.showPerson}
    cocperson = {this.state.person.length}
    toggler = {this.togglerPersonHandler}/>

React map unexpected behaviour

By : basriyilmazturk
Date : March 29 2020, 07:55 AM
This might help you When you want to return true if any of the items passes a test, you can use Array.some():
code :
FeGruHasChilds: (childs) =>
    childs.some(c => c.VALUEDB !== null && c.VALUEDB !== ""); // c => c would be enough if you have strings or null
FeGruHasChilds: (childs) => {
    childs.map((c, i) => { // not returned 
        if (c.VALUEDB != null && c.VALUEDB != "") {
            return true;

Unexpected behaviour when React Native re-renders component

By : user2973414
Date : March 29 2020, 07:55 AM
around this issue you can take a look at this issue, regarding this problem react-native-card-stack-swiper/issues/43 - hopefully, they will fix it at some point.
The issue is that the swiper doesn't look at children when they change, so we must force it to recognize the change, in your example, you can simply use the length of the people, or the ID of the last message from firebase.
code :
<CardStack {...props} key={this.peopleList.length} > {renderCards()} </CardStack>
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