How do you get value from multidimential object when name path is stored in array of unknown length?-CodePudding

I'm creating a folder directory and need to allow users to navigate within it. I have a global variable that stores their location in the directory. How can I access the content within their selected folder.

This is what I what.

let location = ["2022","March","Week4"];
let content = folderInformation["2022"]["March"]["Week4"];

However, the file names "2022, March, Week4, ect" are set by the user.

So I could do this.

let location = ["2022","March","Week4"];
let layer1 = location[0];
let layer2 = location[1];
let layer3 = location[2];
let content = folderInformation[layer1][layer2][layer3];

However, the user could be 2 layers deep or 15.

I tried

let layers = location.join("][");
let content = folderInformation[layers];

and

let layers = "[" location.join("][") "]";
let content = folderInformation layers;

with no success. What is the best option to access the content within the object?

CodePudding user response：

Loop through your array of locations and access every location in the folderInformation object one by one. This way you will go one level deeper with each iteration.

function getFolderInformation(folderInformation, locations) {
  let currentLocation = folderInformation;
  
  for (const location of locations) {
    if (location in currentLocation) {
      currentLocation = currentLocation[location];
    }
  }
  
  return currentLocation;
}

const folderInformation = {
  '2022': {
    'Februari': {
      'Week1': {
        title: 'Nope',
        description: 'Not this one'
      }
    },
    'March': {
      'Week3': {
        title: 'Also no',
        description: 'Wrong'
      },
      'Week4': {
        title: 'Foo',
        description: 'Bar'
      },
    }
  }
};

let locations = ["2022", "March", "Week4"];
let content = getFolderInformation(folderInformation, locations);

console.log(content);

CodePudding user response：

A short version with reduce:

const content = location.reduce((o,l)=>o?.[l],folderinformation);