If you are replacing a property on an object that is a reference to a giant object, does it ever make sense to delete that property before replacing it? vs Answer No, it does not make any difference at all for garbage collecting. Unlike it’s name the delete operator just removes a property of an object.…
Tag: javascript
Lit-element – Importing a component inside another component and then accessing the DOM of the imported component
I’ve honestly racked my brain on this for a couple days. I’m decently new to lit-element and web components in general. Basically, I’m building a new component called <date-picker> and it uses the Flatpickr plugin. This Date Picker component imports another component called <textfie…
With Vue.js, How to use a modal component inside v-for loop?
i made v-for loop cards with vue-Bootstrap. in state, there are dummy. like this. ], and here is my vue.js code and js i just wanna each card has its own modal ex) when i click ManU card, just one modal will be activated and it has ManU data but in my code, when i clicked a card, 3 modals
pass value from span tag to input tag
I have a counter in span tags, when I press Start the timer starts counting and when pressing Pause it is stopped. Now the question is, How do I pass the value from the counter to input tag when Pause clicked? Script Here it is as a runnable snippet: Answer I adjustment your script with template string javasc…
JavaScript counting the chars from one string but not a different string ones?
I am working on a function which is supposed to take a string as a parameter and return it as an object literal where the keys are each letter of the string and the values would be the number of times that letter appears in the string (Excluding whitespaces). I have come up with a code that seems to work,
Passing arguments into props react-native?
I’m new to react and am trying to figure out how things like props work. I want to have it so I can pass a function which i know how to do but i want to do it with some argument. I know my switch statement works because if I manually set the value it works as expected. I’m just
Ramda Curry with Implicit Null
I’ve been trying to learn the Ramda library and get my head around functional programming. This is mostly academic, but I was trying to create a nice logging function that I could use to log values to the console from within pipe or compose The thing I noticed Once you’ve curried a function with R…
Check the element length to flag status boolean
I am assigning as default checked false in this return Object, see the code I have an exception, in case it is my first file dropped i want checked: true, I know that my first file dropped is when const filePosition = files.length returns 0, how can i apply this condition in my checked? Answer If I understand…
Does putting intermediary math results into variables improve performance in javascript?
I have been playing around with the Riemann zeta function. I want to optimize execution time as much as possible here so I put the intermediary results in temporary variables. But testing revealed that I get no performance boost from this. At least not noticeably. My question is: Even though I couldn’t …
How to solve “Uncaught TypeError: Cannot read property ‘params’ of undefined” reactjs + django
i’m practicing reactjs watching this video https://www.youtube.com/watch?v=5rh853GTgKo&list=PLJRGQoqpRwdfoa9591BcUS6NmMpZcvFsM&index=9 I want to verify my information using uid and token, but I don’t know how to deliver it. In this code: Activate.js in container and this code : auth.js in …