Delete the key containing a false value in a JavaScript object

Question

Delete the key containing a false value in a JavaScript object

My task involves modifying an array before sending it to an API that only requires the IDs. The initial array contains both true and false values based on user interaction with the UI.

    [2: true, 3: true, 5: true]

However, in some instances, the array appears like this:

    [1: false, 2: true, 3: true, 5: true, 6: false]

I need a way to filter out the false values and keep only the IDs, resulting in the desired data format:

    [2, 3, 5]

javascript angularjs

Answer 1

Answer №1

The shape of your input is not clearly defined due to the presence of invalid JS syntax in your code.

If we assume that your initial "array" is actually a map (object), you can implement the following solution:

var data = {1: false, 2: true, 3: true, 5: true, 6: false};
var result = []; // initialize an array to store the final result
for (var prop in data) { // loop through all properties of the object
  if (data.hasOwnProperty(prop)){ // check for hasOwnProperty before proceeding
    if (data[prop]) { // only consider truthy values
      result.push(+prop); // convert property key to number and add to array
    }
  }
}

console.log(result); // [2,3,5]

Answer 2

The shape of your input is not clearly defined due to the presence of invalid JS syntax in your code.

If we assume that your initial "array" is actually a map (object), you can implement the following solution:

var data = {1: false, 2: true, 3: true, 5: true, 6: false};
var result = []; // initialize an array to store the final result
for (var prop in data) { // loop through all properties of the object
  if (data.hasOwnProperty(prop)){ // check for hasOwnProperty before proceeding
    if (data[prop]) { // only consider truthy values
      result.push(+prop); // convert property key to number and add to array
    }
  }
}

console.log(result); // [2,3,5]

Answer 3

Answer №2

Let's consider

This is a simple code snippet:

let numbers = [1, 2, 3, 4, 5];

A function that filters out the odd numbers:

function filterOutOddNumbers(array) {
    return array.filter(num => num % 2 === 0);
}

Now, let's use this function:

filterOutOddNumbers(numbers);

Answer 4

Let's consider

This is a simple code snippet:

let numbers = [1, 2, 3, 4, 5];

A function that filters out the odd numbers:

function filterOutOddNumbers(array) {
    return array.filter(num => num % 2 === 0);
}

Now, let's use this function:

filterOutOddNumbers(numbers);

Answer 5

Answer №3

To create a fresh array, simply iterate through the existing one and populate the new array with the true values found.

var original_array = [false, true, true, true, false];
var fresh_array = new Array();
for(i = 0; i < original_array.length; i++) {
    if (original_array[i] == true) {
        fresh_array.push(original_array[i]);
    }
}

Answer 6

To create a fresh array, simply iterate through the existing one and populate the new array with the true values found.

var original_array = [false, true, true, true, false];
var fresh_array = new Array();
for(i = 0; i < original_array.length; i++) {
    if (original_array[i] == true) {
        fresh_array.push(original_array[i]);
    }
}

Delete the key containing a false value in a JavaScript object

Answer №1

Answer №2

Answer №3

Similar questions

Tips for stopping the Bootstrap Modal from appearing every time there is a change event

An undefined variable in Angular 2's evaluation

Error encountered when simulating the effect of calling 'insertPlayerData' function: ReferenceError - currentUserId has not been defined

Ways to verify if an email has been viewed through the client-side perspective

Ordering a ng-repeat loop by complex criteria

Exploring the integration of Firebase with Next.js using getServerSideProps

Please click twice in order to log in to Angular 16

Select a random character from a string using JavaScript

What is the best way to replace a regular expression in JavaScript?

Template for recursive tree structure with ng-click function utilizing a multidimensional index as a parameter

Scope variable changes are not being acknowledged by the directive

Implementing a filter in React with data fetched from MongoDB

How can you check the boolean value of a checkbox using jQuery?

Error in Heroku deployment - Express and React app displaying a white screen

Is it possible to add an array to another array in one go?

Tips on effectively displaying Twitter Bootstrap labels using ng-repeat

In React Native, the onPress handler will continue to be triggered indefinitely after 2-3 presses

Ensuring Redirection to Login Page Upon Refresh in React Router Dom

Using Yii to attach an onclick event to CLinkPager for every pager link

The Chrome browser's memory heap is reported to be a mere 10 MB, yet the task manager displays a whopping