Ways to retrieve the quantity of a particular value within an object using TypeScript

Question

Ways to retrieve the quantity of a particular value within an object using TypeScript

I'm inquiring about how to retrieve the number of a specific value within an object using TypeScript. Here is the structure of the object:

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

The TestObject interface is defined as follows:

export interface TestObject {

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

}

My objective is to determine the count of objects with the "warning" status.

I am looking for a method that will return the count, which should be 2 in this case.

What should the code implementation look like?

angular typescript

Answer 1

Answer №1

To begin, transform the object into an array of key-value pairs using Object.entries. Next, apply a filter function to set the condition, and finally count the length of the values to obtain 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);

Answer 2

To begin, transform the object into an array of key-value pairs using Object.entries. Next, apply a filter function to set the condition, and finally count the length of the values to obtain 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);

Answer 3

Answer №2

const total = 0;
for (const key in object){
    if(object[key].status === "warning"){
        total += 1;
    }
}

Answer 4

const total = 0;
for (const key in object){
    if(object[key].status === "warning"){
        total += 1;
    }
}

Answer 5

Answer №3

To achieve this task, you can utilize the forEach function applied to the array created by using the Javascript method Object.values.

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

Answer 6

To achieve this task, you can utilize the forEach function applied to the array created by using the Javascript method Object.values.

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

Ways to retrieve the quantity of a particular value within an object using TypeScript

Answer №1

Answer №2

Answer №3

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