Find all elements of an object that has no value, empty or null

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I want to return all elements in an object that has no value, empty or null.. (i.e)

 {
   firstname: "John"
   middlename: null
   lastname:  "Mayer"
   age:       ""
   gender:    "Male"
 }

I want to return the middlename and the age in the oject. Please help me. Thank you.

Lets say that your request object is in a variable called obj. You can then do this:

Object.keys(obj).filter(key => obj[key] === null || obj[key] === undefined || obj[key] === "")

Object.keys will fetch all the keys of the object. You will then run a filter function over the object keys to find the required items.

Right now there are three conditions of null, undefined and empty string. You can add more as per your need.

Determining if all attributes on a javascript object are null or an , some() and check if the values are not null and not empty is more efficient than using Array.every and check it the other way around. const isEmpty = !Object  Note that that a null value is less than an empty value, a null value exists when a field has not yet been assigned anything at all (including an empty value). Using the nvl() Function . As validated in the Object Function groovy palette, when fields are used in the code then handling null values is recommended through use of the nvl() function.

Iterate over the entries and filter those properties whose values are null/undefined/empty string:

const obj = { firstname: "John", middlename: null, lastname: "Mayer", age: "", gender: "Male" };
const emptyishProperties = Object.entries(obj)
  .filter(([, val]) => val === null || val === undefined || val === '')
  .map(([key]) => key);
console.log(emptyishProperties);

C#, Example empty values include null, undefined, the empty string, and an array with no members; an object with no enumerable properties I decided not to include the previous check because it introduces an Instead, I opted to keep the function as clear as possible (we're not writing PHP after all). Check undefined, null, empty or blank variable in JavaScript While working with jQuery or JavaScript, if you don’t know whether a variable exists (that means, if it was declared) you should check with the typeof operator.

You can convert the object into array by using Object.keys, Use filter to filter the data.

Note: this will include all falsey values. Like 0, undefined etc

let obj = {
  firstname: "John",
  middlename: null,
  lastname: "Mayer",
  age: "",
  gender: "Male"
};

let result = Object.keys(obj).filter(o => !obj[o]);
console.log(result);

Why is (null==undefined) true in JavaScript?, The value null represents the intentional absence of any object value. It is one of JavaScript's primitive values and is treated as falsy for  The best way to check if an object is empty is by using a utility function like the one below. So if you have an empty object, you can check whether it is empty by using the above function. Alternatively, you can write the isEmpty function on the Object prototype. Then you can easily check if the object is empty like so.

for (var property in obj ) {
    if (obj.hasOwnProperty(property)) {
        if (!obj[property]){
            console.log(property); // This is what you're looking for, OR 'obj[property]' if you're after the values
        } 
    }
}

You can then use matching properties to create your own object. Instead of logging it to console, you could use it to meet your requirements.

How to check if an object is empty in JavaScript, Walk the target object looking for all public properties with a decorator of type 'T' In the case of generic values, this test will fail which is not an issue since we  Pandas: Find Rows Where Column/Field Is Null DZone 's Guide to I did some experimenting with a dataset I've been playing around with to find any columns/fields that have null values in them.

Test for Empty Values in Javascript, If the length of the array is 0, then we know that the object is empty. In the above code, we We can also check this using Object.values and Object.entries . This is typically and return false . If the object doesn't have any properties then it will return true. Classic Mistakes That Every Developer Has Made. The last scenario you may want to test is your variable has a value, it isn’t null or an empty string, but the “value” only consists of spaces. For example, you may have a CSV file that the author accidentally entered a space in a column for which they didn’t intend to enter a value.

null, Find all the combinations of the array values in JavaScript · How to modify URL true if it could find no keys in the loop, which means that the object is empty. Retrieves all the elements that match the conditions defined by the specified predicate.

Generic Null/Empty check for each property of a class, Given a JavaScript Object with null values in it, the task is to remove those null values goes through each key of the object and check if the property has a null value. Copy all the attributes of one element and apply them to another with  One of the biggest gotchas for people new to Powershell is the handling of null, empty arrays, and single-element arrays. If you come from another language such as c# you’ll be shocked. And even for an experienced Powershell writer, the behavior can lead to ugly bugs. Other people have covered this topic before.

Comments
  • Thanks for your explanation sir. Now i know what are the use of Object.keys and .filter() !
  • glad to be of help.