reduce javascript array of objects
I have an Array of objects and I need to return this collection like Object and they key-names need to be indexes of length. I need to filter this object for it values. Here is my code: const data =…
Json document search with ability to group them by a field and return only the documents with the Maximum value of some other field within each group
I want to find the best way to perform a server-side query to find JSON documents by some initial query criteria, then grouping all these documents by some field in the document and then reducing each group to only contain…
reduce: sum of lengths doesn't produce expected result – Javascript
I am trying to access the key 'children' inside of these nested arrays listed below. I want a total count of how many children there are. I am rather new to coding and I've been trying some things out but…
Can we make API call to set the initial state of reducer? – Reactjs
let initialData = { products:[] } const ItemReducer = (state = initialData, action) => { switch (action.type) { case "FETCHDATA": return { ...state, products: action.payload, }; } return state; } let [productdata, setProductdata] = useState(); const dispatch = useDispatch(); useEffect(()=>{…
Json – JS – using reduce to create percentage of presence in an array
I'm trying to use reduce to create an object that contains the percentage of presence of various countries in a list. input: countriesList = ["US","US","US","UK","IT","IT"] desidered output: percCountriesList = [{"country": "US", "weight": 0.5}, {"country": "UK", "weight": 0.1666}, {"country": "IT", "weight":…