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Filtering through 3 arrays to sort data


By : Ajay Narvekar
Date : October 17 2020, 01:08 AM
fixed the issue. Will look into that further I suggest using Array.filter(), Array.some() and Array.includes() here:
code :
//tells us whether a tag should be shown
const isTagVisible = tag => this.props.tags.includes( tag ); 

//tells us whether an item has any tags that should be shown
const doesItemHaveAnyVisibleTags = item => item.tags.some( isTagVisible ); 

//filters only items that have any tags that should be shown
const filteredItems = items.filter( doesItemHaveAnyVisibleTags );


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Why do arrays of numbers, more data sort faster than arrays of objects, fewer data in Javascript?


By : Ronak Singh
Date : March 29 2020, 07:55 AM
wish of those help
Are these conclusions backed by any documentation/something other than my testing? That is, did I reach the correct conclusions?

How do I modify my Quick Sort Algorithm so that it can sort Double data type arrays?


By : alexander cayetano
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You should be able to use generics, where the type implements IComparable, so that you can compare the items (you can't use < or > operators on generic types).
This should do the trick:
code :
public static void QuickSort<T>(T[] data) where T:IComparable<T>
{
    Quick_Sort(data, 0, data.Length - 1);
}

public static void Quick_Sort<T>(T[] data, int left, int right) where T:IComparable<T>
{
    int i, j;
    T pivot, temp;
    i = left;
    j = right;
    pivot = data[(left + right) / 2];

    do
    {
        while ((data[i].CompareTo(pivot) < 0) && (i < right)) i++;
        while ((pivot.CompareTo(data[j]) < 0) && (j > left)) j--;
        if (i <= j)
        {
            temp = data[i];
            data[i] = data[j];
            data[j] = temp;
            i++;
            j--;
        }
    } while (i <= j);

    if (left < j) Quick_Sort(data, left, j);
    if (i < right) Quick_Sort(data, i, right);
}

Sort data by closest geolocation with filtering


By : Jeff Barnes
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Use 'distance' between two points to find the closest. You can't guarantee the user's building but you can guarantee which one is closest with respect to user's co-ordinate.
code :
var keys = Object.entries(data.data).map(([inst, key]) => key);
var returnedBuilding = 
  keys.reduce((prevCord, thing) => {
    var dist = getDistance(userCoordinates.latitude, userCoordinates.longitude, thing.latitude, thing.longitude);
    var prevDist = getDistance(userCoordinates.latitude, userCoordinates.longitude, prevCord.latitude, prevCord.longitude);
    return dist < prevDist? thing : prevCord;
}, keys[0]);
function getDistance(lat1, lon1, lat2, lon2) 
{
  var R = 6371; // km
  var dLat = toRad(lat2-lat1);
  var dLon = toRad(lon2-lon1);
  var lat1 = toRad(lat1);
  var lat2 = toRad(lat2);

  var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  var d = R * c;
  return d;
}

// Converts numeric degrees to radians
function toRad(Value) 
{
    return Value * Math.PI / 180;
}

Data filtering Javascript (Nested dictionary and arrays)


By : user3664777
Date : March 29 2020, 07:55 AM
should help you out every filter function need to return the boolean value.
Inner filter function is fine, But the outer filter function need to change. Following changes should work.
code :
vacancycategories = vacancycategories.filter(cat => {
  return (
    cat.items.filter(vacancy => {
      return vacancy.location.indexOf(city) !== -1;
    }).length > 0
  );
});

Filtering data by posted arrays?


By : dishith
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I think you need to change the database structure. Searching via string is slow(ish), this might work now, but when the dataset increases, this will become a drag.
I think something like this would be better:
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