Address properties that are undefined before they cause an error

Is there a smart way to manage undefined properties and/or identifiers on an object before they result in failure/returning undefined?

Can we intercept access to a non-defined property and address it without resorting to try/catch blocks?

var myObj = {
    myVar : 10,
    myFunc : function(){console.log('foo')}
}

myObj.myVar;
myObj.myFunc();

var x = "myFunc";
myObj[x];
x = "myOtherFunc";
// Is there a way to handle this gracefully before it crashes? 
myObj[x];

I am unable to modify the calling code, but can make changes within myObj as it is a module used by others.

Answer №1

attempt {
  myObj.anotherFunction();
} catch() {

}

myObj.anotherFunction() || ""; //set as default value;

myObj.anotherFunction() || myObj.myCustomFunc(); //set as default value;

if (let x = myObj.anotherFunction())
  // do something
else
  // do something else

Answer №2

Give this a shot:

if(object.hasOwnProperty(property)) {
    object[property];
}

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Nested pages are causing jQuery plugins to malfunction

I am currently working on a website, but I am facing some issues with the product listing pages and the tips and tricks page. It appears that there is an issue with jMenu and jFlipBook plugins not functioning properly. Since I didn't develop the origi ...

Waiting for the response to come by subscribing in Angular

I am encountering an issue while trying to subscribe to an Observable and assign data from the response. The problem is that my code does not wait for the response before executing the console.log(this.newIds) line, resulting in an empty value being logg ...

Remove the </div> text and replace it with nothing

I'm attempting to substitute the end tag div with an empty string. Here is my code: $('#textDiv').html().replace(/'</div>'/g,'').replace(/<div>/g,'\n') This is the HTML: <div id='tex ...

Enhancing webpage styles with AngularJS

Just starting out with AngularJS and eager to get the best approach to tackle this challenge. Describing my dilemma: I have an anchor element that, when clicked, needs to toggle between classes "show-all" and "hide-all" while also updating the styling of ...

Edge Browser does not support PHP Websocket technology

I created a multiplayer card game and incorporated a websocket for functionality. To integrate the websocket in php, I utilized this specific library After deploying it on my Ubuntu server, the program functioned smoothly on Chrome and Firefox (The fronte ...

Perform a single click and a double click on an anchor element in the document

I am attempting to implement two actions when a user clicks on an anchor tag. The anchor tag will contain a video link. My goal is for the URL to open in a new window when the user single-clicks on the anchor tag, and for the use of the HTML5 download attr ...

Tips on displaying information following the parsing of JSON

Trying to retrieve a list of users using this code snippet <div id="users" data-users='[{"name":"one","userName":"user_one"}, {"name":"two","userName":"user_two&q ...

A guide on converting character objects to strings

Presented below is an array of characters: Resource {0: "-", 1: "-", 2: "-", 3: "-", 4: "-", 5: "B", 6: "E", 7: "G", 8: "I", 9: "N", 10: " ", 11: "C", 12: "E", 13: "R", 14: "T", 15: "I", .... } I am looking to convert it into the following format: --- ...

How to enable Autocomplete popper to expand beyond the menu boundaries in Material UI

Within my Menu component, I have an Autocomplete element. When the Autocomplete is clicked, the dropdown list/Popper appears but it's confined within the Menu parent. How can I make it so that the Autocomplete's dropdown list/Popper isn't re ...

You have encountered an error: Uncaught TypeError - the function (intermediate value).findOne is not defined

Encountering an error when attempting to call the getStocks function from a Vue component. smileCalc: import User from "../models/user.js"; let userID = "62e6d96a51186be0ad2864f9"; let userStocks; async function getUserStocks() { ...

How can VueX be leveraged to add an item to an array and also delete an item from the same array?

https://stackblitz.com/edit/vue-script-setup-with-vuex-gfjaff?file=src/components/UserProfile.vue I'm currently working on a feature where I can input a name into a dispatch function and have it added to an array. Eventually, I plan to include a text ...

Interactive preview of PDFs with pdf.js adaptation

How can I update my PDF preview when resizing the window? Currently, the canvas resizes but the PDF preview remains the same size. I am struggling to find a solution for this. var myState = { pdf: null, currentPage: 1, zoom ...

Attempting to instruct my chrome extension to execute a click action on a specific element found within the webpage

I am currently working on developing a unique chrome extension that has the capability to download mp3s specifically from hiphopdx. I have discovered a potential solution, where once the play button on the website is clicked, it becomes possible to extract ...

Why isn't my ng-click function functioning properly on Google Maps in AngularJS?

i have two stores in my database and am attempting to display them on a Google map with markers. I have an ng-click function inside the info window to pass the store id, but it seems like ng-click is not working. Is there any alternative method to pass t ...

Incorporating FaceBook into a PhoneGap Application

Currently, I am working on integrating Facebook into my phonegap/cordova application. To guide me through the process, I am using the resources provided in this link: https://github.com/davejohnson/phonegap-plugin-facebook-connect/ Even though I have bee ...

HTML counterpart to PHP's include for JavaScript components

I am searching for a Javascript alternative to a method I have been using in PHP. Specifically, I want to streamline the basic setup of my pages: <!DOCTYPE html> <html lang="en"> <head> <meta ch ...

What is the best way to create fading text effects in an AngularJS application?

Running an AngularJS web application that showcases three words for 5 seconds each: Hello, World & Goodbye. The controller setup is as follows: self.currentIndex = 0; self.myTexts = ['Hello', 'World', 'Goodbye']; self.cu ...

Placing a div with position:absolute inside another div with position:absolute and turning them into position:fixed

HTML <div class="box1"></div> <div class="box2"> <div class="box3"></div> </div> CSS Properties of box1, box2 and box3 are: box1 { position: absolute; z-index: 100; background-color: rgba(39, 39, 39, 0.3) ...

Changing the image's flex-grow property will take precedence over the flex settings of other child

This is the error code I am encountering, where "text1" seems to be overridden <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <!--mobile friendly--> <meta name="view ...

When capturing photos using h5 on iOS devices, the browser may experience a flash back issue

I have been searching Baidu and Google for a while now, but I still haven't found a solution. Here is the specific issue: When using h5 to take photos on iOS systems, the browser flashes back. HTML Code <img src="xxx" onclick="sta ...