Find empty and null values in object and update in a counter javascript

Question

I have the below object and I want to count the empty or null values in the object and update it in a property counter of that object.

E.g. I have this below object.

var userData = {
  firstName: "Eric",
  lastName: null,
  age: "",
  location : "San francisco",
  country: "USA",
  counter: 0
}

The result of iterating through this object would let us know that lastName and age is empty or null, so it should update counter: 2 indicating that 2 fields are empty.

obj userData = {
  firstName: "Eric",
  lastName: null,
  age: "",
  location : "San francisco",
  country: "USA",
  counter: 2
}

How can I achieve this?

Unmitigated · Accepted Answer · 2020-09-10 18:35:11Z

3

You can filter through the values of the object using a Set to store all values considered empty.

const userData = {
  firstName: "Eric",
  lastName: null,
  age: "",
  location : "San francisco",
  country: "USA",
  counter: 0
};
const emptyValues = new Set(["", null, undefined]);
userData.counter = Object.values(userData).filter(x => emptyValues.has(x)).length;
console.log(userData);

We can use reduce instead of filter to minimize memory usage.

const userData = {
  firstName: "Eric",
  lastName: null,
  age: "",
  location : "San francisco",
  country: "USA",
  counter: 0
};
const emptyValues = new Set(["", null, undefined]);
userData.counter = Object.values(userData).reduce((acc,curr) => acc + emptyValues.has(curr), 0);
console.log(userData);

edited Sep 10, 2020 at 18:35

answered Sep 10, 2020 at 18:12

Unmitigated

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Comments

Ele · Accepted Answer · 2020-09-10 18:37:41Z

1

You can use the function Objec.values for accessing the values of the object and the function Array.prototype.reduce for counting the empty values.

const userData = {  firstName: "Eric",  lastName: null,  age: "",  location : "San francisco",  country: "USA",  counter: 0},
      emptyValues = ["", null];
      
userData.counter = Object.values(userData).reduce((r, c) => r + emptyValues.includes(c), 0);
console.log(userData);

answered Sep 10, 2020 at 18:37

Ele

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