Feb 24, 2016 · for (var i in obj) { if (obj[i] === null || obj[i] === undefined) { delete obj[i]; } return obj; This is the actual question: Make a function that takes in an object, loops through all its properties, and removes any that are falsy. Then return the object that was passed in. (hint: delete)

Jun 1, 2015 · To remove those properties you can use this algorithm: if (myObj.hasOwnProperty(k) && myObj[k] === false) delete myObj[k]; If you are just interested in the keys of non- false values, you can use: return myObj[k] !== false;

Feb 7, 2018 · The answer to "can I do x to an object" (or an array for that matter) is usually "yes" and it frequently involves some form of reduce. If you want to filter falsy values you could do something like this:

May 10, 2016 · This method iterates over an object and removes all keys with falsy values. That is, falsy values will cause the key/value pair to be removed from the object. This is very useful for removing unwanted data from an object. See this page for more information about falsy values. Note this does a "shallow" pass, so nested falsy values will not be ...

Apr 8, 2021 · Sometimes we want to remove null, empty, undefined, false value attribute from an object. we can do this using the below method.

Jan 2, 2024 · Generally speaking, you can use the Boolean function to filter out all falsy values (false, null, 0, '', undefined, and NaN), compacting the array or object in the process. Compacting an array is as simple as using Array.prototype.filter() combined with the Boolean function.

Mar 3, 2025 · Write a JavaScript program to remove all false values from an object or array. Use recursion. Initialize the iterable data, using Array.isArray (), Array.prototype.filter () and Boolean for arrays in order to avoid sparse arrays. Use Object.keys () and Array.prototype.reduce () to iterate over each key with an appropriate initial value.

In this lab, we will explore how to use recursion to deeply remove all falsy values from an object or array in JavaScript. We will create a function that takes an object or array as input and returns a new, compacted object or array with only truthy values.

Sep 21, 2022 · This function will remove all falsy values like null, undefined, 0, '', false from an object and its nested children. Allow passing custom falsyValues to remove and return a new object without the falsy values.

Nov 18, 2019 · const removeFalsy = (myObject)=>{ const new_obj = {...myObject}; Object.keys(new_obj).forEach(key=> new_obj[key] || new_obj[key]===0 ? new_obj[key] : delete new_obj[key]); return new_obj; } See if this works. Here we created a pure function to copy the object, remove falsy keys and then return the new object.