check arrays inside an array and filter based on a value in angular 2

Question

This is the JSON for user data.

result = {
  "id": 5529,
  "roles": [
    {
      "id": 10,
      "name": "ADMIN",
      "privileges": [
        {
          "id": 100,
          "name": "ADD",
          "systemId": 3
        },
        {
          "id": 115,
          "name": "DEL",
          "systemId": 3
        }
      ]
    }
  ]
}

Have to check the given privilege value exist in the List and return true or false.

Tried few codes but not working as expected, one such code tried is given below. Here privilege = DEL, then it should return true.

result.roles.forEach((element:any) => {
                   element.privileges.filter(function(item:any){
            if(item.name === privilege)
                return true;
            else 
                return false;
            });

How can I check arrays inside an array efficiently and filter based on a value and return the result.

BTW, instead if(item.name === privilege) return true; else return false; }); you can write just return item.name === privilege; — Maxim Shoustin
– Maxim Shoustin, Commented Aug 29, 2017 at 6:15

Parth Acharya · Accepted Answer · 2017-08-29 06:45:39Z

3

While forEach function operates on the original array, Filter function doesn't. It gives the filtered array as output. So you are filtering the data inside alright but it is not getting assigned to the actual array.

Try this,

result.roles.forEach((element) => {
    element.privileges = element.privileges.filter(function (item) {
        return item.name === privilege
    })
})

Edit :- I hope this is what you are looking for continuing from what you started.

let val = result.roles.filter((element) => {
    return element.privileges.filter(function (item) {
        return item.name === privilege
    }).length != 0
}).length != 0

Edit 2 :- However a more efficient and understandable solution would be

function check() {
    for(role of result.roles){
        for(tmpprivilege of role.privileges){
            if(tmpprivilege.name === privilege){
                return true;
            }
        }
    }
    return false;
} 

let val = check()
console.log(val)

edited Aug 29, 2017 at 6:45

answered Aug 29, 2017 at 6:13

Parth Acharya

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5 Comments

user630209 Over a year ago

Its not returning any result even though having matching data.

Parth Acharya Over a year ago

Check the edit, i have given it a try but your requirement is a bit unclear to me, what exactly you want. Please elaborate the scenario

user630209 Over a year ago

I need to return from this one equal condition satisfied, either save that value in a variable or return from the method.

Parth Acharya Over a year ago

So this whole function, roles.forEach should return a true false based on if any element of this array contains a privilege or not.

user630209 Over a year ago

Yes, its not returning tried with the updated answer, let val : boolean = result.roles.forEach((element: any) => { return element.privileges.filter(function (item: any) { return item.name === privilege }).length != 0 }) console.log("val "+val);

basarat · Accepted Answer · 2017-08-29 05:46:05Z

0

result.roles.forEach((element:any) => {

Use some https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/some

result.roles.some((element:any) => {
               return element.privileges.filter(function(item:any){
        if(item.name === privilege)
            return true;
        else 
            return false;
        }).length;

answered Aug 29, 2017 at 5:46

basarat

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1 Comment

user630209 Over a year ago

Its not returning any value

kjppster · Accepted Answer · 2017-08-29 09:24:28Z

0

In angular you can use for:

function filterTable(result:any){
let tmpArray: any=[]
for (let result of this. result.roles){
  for(let priv of result.privileges){
     if(priv.name==="DEL"){
       tmpArray.push(result)
   }     
}
return tmpArray;}

edited Aug 29, 2017 at 9:24

answered Aug 29, 2017 at 6:09

kjppster

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2 Comments

user630209 Over a year ago

This we can achieve in angular2 also, but how to return the value is my question

kjppster Over a year ago

Now you have result in tmpArray and you can returned it.

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