Check property exist in object or not in JavaScript?

Question

I have one problem statement.

Implement a function propertyExists(obj, path) that takes in an object and a path (string) as arguments and returns ‘False’ if the property doesn’t exist on that object or is null, else returns the value of the property.

And here is solution.

function propertyExists(obj,path) {
    // Write logic here
    let result =  obj.hasOwnProperty(path);
    if(result)
    {
     return (obj.path);       
    }
    else
    {
        return result;        
    }
}

Is this correct way of doing it?

It depends on what the definition of path is, for me a path would be something like.. header.customer.address.lines[0] etc. But then your have called it propertyExists, so its likely property anyway, so not sure why its not propertyExists(obj, property) You likely want return obj[path] too. — Keith
– Keith, Commented Nov 16, 2021 at 11:11
The check seems incomplete based on requirements. You could be specific here. -> if (obj[path] === undefined || obj[path] === null) { return false; } else { return obj[path]; } — Keith
– Keith, Commented Nov 16, 2021 at 11:14
@SifatHaque Yes when I am submitting the solution I am getting wrong answer message — Deepak _8097
– Deepak _8097, Commented Nov 16, 2021 at 11:14

vaira · Accepted Answer · 2021-11-16 12:01:59Z

1

Multiple issues: the first name of the function should represent what it is doing, Path as variable name is vague but propertyName as a variable is clear. what you should do is either:

write function called, "getValue" it returns value if exist or null

    function getValue(obj,propertyName) {
            if(!obj) { // if object not exist
           return null;
            }
           return  obj[propertyName];
        }

write function called, "propertyExists" should return true if exist else false.

   function propertyExists(obj,propertyName) {
        if(!obj) { // if object not exist
       return false;
        }
       return  obj.hasOwnProperty(propertyName);
    }

edited Nov 16, 2021 at 12:01

answered Nov 16, 2021 at 11:19

vaira

2,2801 gold badge13 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Susheel Kumar · Accepted Answer · 2022-09-15 06:05:17Z

1

function propertyExists(obj,path) {
    // Write logic here
    for(i in path){
        if(obj.hasOwnProperty(path[i]) === true){
            obj = obj[path[i]];
        }else{
            return false;
        }
    }
   return obj;
}

answered Sep 15, 2022 at 6:05

Susheel Kumar

111 bronze badge

2 Comments

Susheel Kumar Over a year ago

it may help to understand

Community Over a year ago

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.

Ankit singh · Accepted Answer · 2022-01-29 06:53:42Z

0

object->obj,propertyname->path

function propertyExist(obj, path){
           if (obj.hasOwnProperty(path)) return obj[path];
                   else return false;
                      };

answered Jan 29, 2022 at 6:53

Ankit singh

12 bronze badges

1 Comment

Community Over a year ago

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.

Atul Kumar · Accepted Answer · 2022-06-11 13:48:53Z

0

Here, as far as I can understand, the objects could be nested also.

Let's take obj as {"a":{"b":"dadsa"}} and path as ab

Now, the the solution which you have posted will not work. Ideally, it should return dadsa, but it will return false.

Try the below code, it will work for nested objects also.

function propertyExists(obj,path) {
    // Write logic here
    var val=obj;
    for(a of path){
        val=val[a];
        if(!val)
            return false;
    }
    return val;
}

edited Jun 11, 2022 at 13:48

answered Jun 11, 2022 at 13:14

Atul Kumar

1291 silver badge9 bronze badges

Comments

Suraj Rao · Accepted Answer · 2022-12-25 12:21:16Z

0

function propertyExists(obj,path) {
    var val = obj;
    for (a of path) {
     val = val[a];
    if (!val){
      return false;
     }
     return val;
 }

edited Dec 25, 2022 at 12:21

Suraj Rao

29.7k11 gold badges96 silver badges104 bronze badges

answered Dec 25, 2022 at 12:10

Nirupam Sikdar

1

Collectives™ on Stack Overflow

Check property exist in object or not in JavaScript?

5 Answers 5

Comments

2 Comments

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

2 Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related