Whenever i tried to put something in my todoList there's alwasy an empty element at first indext Why it is happening? const [todoList, setTodoList] = useState([]); const addToList = (inputText) => { if (inputText === "") { alert("List is Empty")…
I have data from a form that needs to be compared to its older data. I want to check if an object was in the previous old data and if its slot number changed. Data example const oldData = [{name:…
I am trying to understand the 2D Arrays in Google Apps script and I have been stuck with this unexpected behavior, I want to change just one element within an I and J position but it results to changing many…
I was changing a state between renders and logging that value on every time the state changes via useEffect. I noticed my console is showing this error bellow: image of console showing the error. I'm not understanding why is it…
The syntax is identical so how does JavaScript distinguish the two under the hood? Does it look at the data type of the variable that is being operated on? Or where that variable is being used? Both or neither?
In this array output, how can I count the type column? Or better, how can I exclude the addition_data when counting it? Answer should be 3 since there are only 3 type column Array ( [124] => Array ( [type]…
I need to make reservation system for test with HTML, CSS, JS. i need to change color of border from li's. But i need to select only one li if i select one it must be add class, when i…
I would like to average several time-series arrays of different length using Javascript in an efficient manner. The reason for having different length is because some data is missing in some of the arrays. Time should be used as the…
I have an object and an array. Say: const first = { 'key1': 'some date', 'key2': 'some date' } const second = ['key3', 'key4'] Then using spread syntax I want to combine then into single object. For each item in…
I got a question for an algorithm to divide a given array into the sub parts. Here is the scenario. I have 3 items to ship. Weights of items are [10 lb, 15 lb , 5 lb] I need to…