I want to lookup for a key on an object, but if the key does’t exist, it must return null, is it possible in JavaScript? Answer You can use or: || or the newer optional chaining and Nullish coalescing operator NOTE: the arrow function suggested by Máté Wiszt has to be wrapped in () or it will give an er…
Finding values or objects in a json file with nested objects and passing the result object to child in Javascript and react
I am working on a react project where I am dealing with a json file of the following format. The data from the json file (name , age, height , location) is shown in a table in a child component but now I am working on a functionality such that on whatsoever row of the table is clicked that rows
Javascript Dynamic Data binding code not working
I am writing code that uses data binding to change the innerHTML of an span to the input of the user, but I can’t get it to work. What it should do is show the input on the right side of the input field on both the input fields, but it doesn’t. Can someone please help me out. HTML: Javascript:
JavaScript sort multiple array
Suppose I have this data Name Mark John 76 Jack 55 Dani 90 and for the grade Marks Grade 100-80 A 79 – 60 B 59 – 40 C suppose i declare the script as The program should assign the grade with the corresponding mark, how do I sort the grade since we know we cant change the index for
Increment 2 variables in paralell Node-RED
I am trying to create a script that creates 2 variables, and increments each one of them based on a condition. The actualNetWeight is received in real-time with a MQTT connection to a server and the values are displayed in a line chart. When this value is over or equals to 0.500, I have to count that item ent…
React.js, map is not rendering components
I have this as top component: This is my Main component: And this is Thread component: But iteration is never reaching Thread component. And this [{ post: “b” }] that i used as initial state is not getting printed on screen. What could be the issue? That is currently the output coming: Answer It i…
Can I rethrow a rejected await function, and catch it immediately
I’d like to catch all my exceptions in one place, but I can’t do that currently: There is an important thing to note if you like more try/catch. The following code won’t catch the error: […] Remember: a rejected Promise will propagate up in the stack unless you catch it. To catch the e…
Getting undefined is not an object when using react-native’s FlatList
Recently began to study React Native. Now I try to display an array of objects on the page. I did everything as if right, but I get an error: I have two questions, what am I doing wrong and why in React Native, elements are displayed using FlatList and not via the map method? Here is my code snippet: Answer
Invalid token, state does not match – Auth0 Error Safari only
while using parseHash function in Auth0 library in safari I am getting error Same code is working fine in chrome. what can be possibly done to resolve this issue? Answer After lots of research and article exploration, I finally found a solution to this issue. As auth0 is unable to access state and nonce param…
Outlook addin open panel after send
I’ve created addin that checks recipients on-send. I wanna inform the person with the taskpanel. I’m trying to do “Show task pane” from the js to open that panel. Is there a way to do that? UI Dialog is a problem cause there old office’s versions in my company As the Emoji addin …