how to get the number of the value in a object in typescript

Question

I have a question about hot to get the number of a value in object with typescript. the object looks like this:

obj : TestObject = {
 name: "test",
 street: "test"
 subobj1: {
   status: warning,
   time: 11
   }
subobj2: {
   status: oki,
   time: 12
   }
subobj3: {
   status: warning,
   time: 13
   }
}


}

the TestObject is defined:

export interface TestObject {

 name: string,
 street: string,
 subobj1: SubObj1,
 subobj2: SubObj2

}

so I want to get the number of warning

I want to a method, which in this case returns 2 back.

how should the code look like?

Do you want to collect all the values from all the arrays?

Eli Porush
– Eli Porush

2022-09-08 09:50:58 +00:00
Commented Sep 8, 2022 at 9:50 — Eli Porush
– Eli Porush, Commented Sep 8, 2022 at 9:50

Naren Murali · Accepted Answer · 2022-09-08 10:24:51Z

3

First convert the object to array of key and values using Object.entries then use filter for the condition, finally length of the values is the desired output!

let obj = {
  name: "test",
  street: "test",
  subobj1: {
    status: 'warning',
    time: 11
  },
  subobj2: {
    status: 'oki',
    time: 12
  },
  subobj3: {
    status: 'warning',
    time: 13
  },
}
console.log(Object.entries(obj).filter(([key, value]) => key.indexOf('subobj') > -1 ? value.status === 'warning' : false).length);

edited Sep 8, 2022 at 10:24

answered Sep 8, 2022 at 9:53

Naren Murali

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9 Comments

user1938143 Over a year ago

Hi, I have edited this object? I have tested your code, it does not work.

Naren Murali Over a year ago

@user1938143 Could you share the object you are testing with, in the question? with this code?

user1938143 Over a year ago

Hi the error is: Property 'status' does not exist on type TestObject

Naren Murali Over a year ago

@user1938143 Could you share the original angular code where the error occours, if possible a stackblitz. else you can put any type to the property and solve the issue!

user1938143 Over a year ago

the problem is, the object ist a type of TestObject.

|

xaleel · Accepted Answer · 2022-09-08 09:53:30Z

0

let sum = 0;
for (const subobj in obj){
    sum += obj[subobj].status == "warning" ? 1 : 0;
}

answered Sep 8, 2022 at 9:53

xaleel

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Comments

f.khantsis · Accepted Answer · 2022-09-11 13:30:05Z

0

You can do this with a forEach function on the array generated by the Javascript Object.values method.

let sum = 0;
Object.values(obj).forEach(value => {
    if(value.status == 'warning'){
        sum += 1;
    }
});

edited Sep 11, 2022 at 13:30

f.khantsis

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answered Sep 8, 2022 at 9:58

NotDavid

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