Compare two array of objects to find distinct values by all key values So I found a lot of documentation like Get unique values by comparing old and new array objects but my case is a bit more complex. In my case I want to compare two databases of prices, every week, finding out which prices have changed and …
Tag: javascript
How can I resize element to fit its parent element?
I want to place the <input> element inside <td> without the <td> element being resized. These are my CSS codes: My JavaScript codes: I’m using this.body because these two codes are inside the class constructor. How can I solve this problem? I tried to use max-width and max-height, but …
JS doesn’t change the value of input
I’m writing cart-box that will change the quantity of products in cart. It works only if I have one box (one product) in cart, but when I have more products in cart it changes the value of the first input only. This is my html code (earlier in the code I’ve got loop for my products): And this is J…
Undefined trying to access a variable of a class written in JS
I am trying to make this code works properly: I have been without working with classes a lot of time, and I know is undefined because the method remindMe doesnt have access to the constructor, because it doesnt have a getter. But I have tried to create a getter and it didnt leave me to call it from the method
Why in this case order of conditions matter?
Hi everyone First of all sorry for the dumb question. I’m a newbie and can’t really figure out by myself why in this case (in this particular order) condition will not work as expected (is not deleting ‘tracks’ property) until being swapped with Answer That’s because when prop is…
What does it mean by Object.assign(fn, {x: () => {}, y: () => {}})?
Let’s I have a function defined as below, When I do console.log(calculateHash()), it logs as, …and when I do, It actually calls the async function. How does it work here? When I do Object.assign(obj1, obj2), it will merge them; if properties are same it will override. So, I think here Object.assig…
Javascript check if any elements in array are equal
How should I make a function that loops through an array, and checks if any elements are equal Example: EDIT: I want to use it with nested arrays, like so: EDIT again: I want the nested arrays to be the exact same Answer You can easily do this using Set as: You can add all elements to set and then
What would be the purpose of if (thisValue.getTime() === thisValue.getTime())
I have inherited a web project in PHP and of course JS. What purpose would this code below serve in JavaScript? Seems that the ‘if’ would always be true and the else will never execute. The developer who wrote this is no longer accessible to be asked what he intended by this. Answer getTime() shou…
Regex split string at specific set of characters
Suppose I have a string of this nature Set 1 (2) Set 2 (2) Set 3 (2) Set 4 (2) [Choose Two]. How can I make a regex that starts after (important that it’s after or I can just add it back) every ) character and optionally ends at a ] character, so splitting the string would look something like
React Native, FlatList does not output my list correctly
I have this quite easy items where I normally loop over with map: The above code works fine, but as I learned, it is better do use FlatList in my components do render something in a loop. So I tried the following: The correct amount of items are rendered, but unfortunately, none of the props gets passed to th…