up vote 0 down vote favorite

I want to output only the roles that contain the same group as the user.

// User can be part of many groups
const user = {
  groups: ["group2"]
};

// Roles can have many groups
// What you see here is the output or 2 different data source
// Thats why we have group duplication inside different role
const roles = [{
  name: "role1",
  groups: [{
    id: "group1"
  }]
}, {
  name: "role2",
  groups: [{
    id: "group1"
  }, {
    id: "group2"
  }]
}];

const result = roles.filter(role => role.groups.filter(group => user.groups.indexOf(group.id) > -1).length)
console.log(result);

Is there a better way by using reduce or something else?

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1  
Perhaps roles.filter(role => role.groups.find(group => user.groups.includes(group.id))) – Xotic750 Sep 20 '16 at 18:15
1  
Also you have defined const roles and then you try to redefine it. – Xotic750 Sep 20 '16 at 18:35
    
Thanks for the .includes ;) – jdsninja Sep 20 '16 at 18:50
up vote 1 down vote accepted

This is little neater IMO.

// User can be part of many groups
const user = {
  groups: ["group2"]
};

// Roles can have many groups
// What you see here is the output or 2 different data source
// Thats why we have group duplication inside different role
const roles = [{
  name: "role1",
  groups: [{
    id: "group1"
  }]
}, {
  name: "role2",
  groups: [{
    id: "group1"
  }, {
    id: "group2"
  }]
}];

const result = roles.filter(role => role.groups.find(group => user.groups.includes(group.id)));
console.log(result);

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