How to write a Map for a list of objects using Angular js

Question

I have an array of user objects called allUsers and I need to check each object in it with the groupId which is passed to the function and return userNames which have the passed groupId.

I attempted this in the following manner.

vm.setNames=function(groupId){
        var products = "";
        angular.forEach(vm.allUsers,function (f) {
            if(f.groupId==groupId){
                vm.user=f;
                users= users+','+" "+vm.user.userName;
            }
        })

        return users= ;
    }

I want to have it in a map with group id as the key and relevant user names as values and return the relevant user names. How can I do that?

lifeisfoo · Accepted Answer · 2017-11-02 10:34:28Z

3

You can easily achieve that using the Array.reduce prototype function:

var allUsers = [
  { groupId: 1, userName: 'mario' },
  { groupId: 1, userName: 'luigi' },
  { groupId: 2, userName: 'peach' },
  { groupId: 2, userName: 'koopa' }
]

var getNames = function getNames(groupId, users) {
  return users.reduce(function(res, u) {
    if (u.groupId === groupId) {
      res = res + (res.length > 0 ? ', ' : '') + u.userName
    }
    return res
  }, '')
}

console.log(getNames(1, allUsers))

edited Nov 2, 2017 at 10:34

lifeisfoo

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answered Nov 2, 2017 at 10:17

whirmill

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