Mapping data from two dictionary and make a resultant one with specific format in javascript

user_6640801 0
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I have a two dictionaries:

featurePermissionMap = {'2':2,'3':1,'4':1} where key is the feature id and it's value represents the permission type. Like '2':2 means for a feature id 2 we have a permission 2(Read and Write) and '3':1 means for a feature id 3 we have a permission 1(Read-Only)

Second Dictionary:

feature_with_sub_feature = 
[
{ name: 'FeatureA', 
  subfeatures: [
   { id: 2, name: 'Feature2' },
   { id: 3, name: 'Feature3' },
},
.......
];

I need a resultant dictionary like below:

read_write_access_feature = {
  'read':{},
  'write':{}
}

I just want to iterate over feature_with_sub_feature and based on subfeature id, I want output like

read_write_access_feature = {
  'read':{'FeatureA':['Feature3',....],......},
  'write':{'FeatureA':['Feature2',.....],....}
}

I am trying to achieve this using the two forEach. I am new to javascript. Any optimized way would be much appreciated.

Any help/suggestions would be much appreciated.

javascript
1 Answers

Added function getFeatureWithPermission which will return features with permission passed in parameter. Added code explanation in comment.

call getFeatureWithPermission will required permission as below.

let read_write_access_feature = {
  'read': getFeatureWithPermission(1),
  'write': getFeatureWithPermission(2)
};

Try it below.

let featurePermissionMap = {'2': 2, '3': 1, '4': 1};

// return features with permission passed in parameter.
function getFeatureWithPermission(permission) {
  // use reduce to update & return object as requiment
  return feature_with_sub_feature.reduce((a, x) => {
    // return object with key as x.name
    // value as array of names from subfeatures which have respective permission
    // first filter subfeatures for respective permission
    // then use map to select only name from subfeatures
    a[x.name] = x.subfeatures
        .filter(y => featurePermissionMap[y.id] === permission)
        .map(y => y.name);
    return a;
  }, {}); // <- pass empty object as input
}


let feature_with_sub_feature =  [{ 
  name: 'FeatureA', 
  subfeatures: [
    { id: 2, name: 'Feature2' },
    { id: 3, name: 'Feature3' },
  ]
}];

let read_write_access_feature = {
  'read': getFeatureWithPermission(1),
  'write': getFeatureWithPermission(2)
};

console.log(read_write_access_feature);

user_96952860
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