Execute a skip function on the source object

Question

Execute a skip function on the source object

I'm completely new to using underscore js, and I'm attempting to exclude a specific property from an Object. What I tried was

myObj = _.omit(myObj,name)
console.log(myObj);

However, the myObj still retains the property name. Interestingly, if I do this it appears to work:

newMyObj= _.omit(myObj,name) 
console.log (newMyObj)

it seemed to work fine. Am I making a mistake somewhere? Can someone offer any help? Here's how the myObj is structured:

Angola: "4.134137685",Brunei: "2.532726835",Countries: "2004",Croatia: "1.717672961", keys: Array[11]

I am aiming to omit "keys," which happens to be an array of objects.

Thank you

javascript underscore.js

Answer 1

Answer №1

If you're not familiar with debuggers, it's time to make them your best friends. Take a moment to understand what they are and how they can help you in your coding journey. Look up resources like "Chrome devtools" on Google and start using breakpoints before calling _.omit. Dive into the console by typing myObj and name to examine their contents, or utilize the 'Scope Variables' section for a deeper analysis. Take a single step (F10) and observe any changes in variables, or recheck the value of myObj in the console.

In your case, you've noticed that property deletion works fine with newMyObj= _.omit(myObj,name), but not with myObj= _.omit(myObj,name). This behavior is puzzling and hints at underlying factors you're overlooking. Perhaps there's more to the story, like this example:

myObj = { keys: [] };
name = "keys";
delete_property();
console.log(myObj.keys); // []

function delete_property(myObj) {
    myObj = _.omit (myObj, name);
}

This setup doesn't function as expected because the assignment within the function merely alters the argument's value without affecting the external myObj. For a comprehensive solution, share more of your code for further insights. Nonetheless, tackling such debugging challenges is an integral part of becoming a seasoned programmer, so embrace the troubleshooting process with curiosity and enthusiasm.

Answer 2

If you're not familiar with debuggers, it's time to make them your best friends. Take a moment to understand what they are and how they can help you in your coding journey. Look up resources like "Chrome devtools" on Google and start using breakpoints before calling _.omit. Dive into the console by typing myObj and name to examine their contents, or utilize the 'Scope Variables' section for a deeper analysis. Take a single step (F10) and observe any changes in variables, or recheck the value of myObj in the console.

In your case, you've noticed that property deletion works fine with newMyObj= _.omit(myObj,name), but not with myObj= _.omit(myObj,name). This behavior is puzzling and hints at underlying factors you're overlooking. Perhaps there's more to the story, like this example:

myObj = { keys: [] };
name = "keys";
delete_property();
console.log(myObj.keys); // []

function delete_property(myObj) {
    myObj = _.omit (myObj, name);
}

This setup doesn't function as expected because the assignment within the function merely alters the argument's value without affecting the external myObj. For a comprehensive solution, share more of your code for further insights. Nonetheless, tackling such debugging challenges is an integral part of becoming a seasoned programmer, so embrace the troubleshooting process with curiosity and enthusiasm.

Answer 3

Answer №2

My understanding of this question is that you are looking to eliminate a property from an object using the omit() method. It's important to note that omit() creates a new copy of the object without the specified property, without modifying the original object.

Based on this context, the code provided below, which aligns with your current implementation, functions correctly:

var copy,
    obj = {
        Angola: "4.134137685",
        Brunei: "2.532726835",
        Countries: "2004",
        Croatia: "1.717672961", 
        keys: Array[11]
    },
    check = function (o) {
        _.each(o, function (value, key) {
            console.log("key: " + key + " value: " + value);
        });
    };


copy = _.omit(obj, "keys");
check(copy);

obj = _.omit(obj, "keys");
check(obj);

Whether you assign the result to a new variable or update the existing one, the output remains consistent.

Answer 4

My understanding of this question is that you are looking to eliminate a property from an object using the omit() method. It's important to note that omit() creates a new copy of the object without the specified property, without modifying the original object.

Based on this context, the code provided below, which aligns with your current implementation, functions correctly:

var copy,
    obj = {
        Angola: "4.134137685",
        Brunei: "2.532726835",
        Countries: "2004",
        Croatia: "1.717672961", 
        keys: Array[11]
    },
    check = function (o) {
        _.each(o, function (value, key) {
            console.log("key: " + key + " value: " + value);
        });
    };


copy = _.omit(obj, "keys");
check(copy);

obj = _.omit(obj, "keys");
check(obj);

Whether you assign the result to a new variable or update the existing one, the output remains consistent.

Execute a skip function on the source object

Answer №1

Answer №2

Similar questions

Having trouble with Vuex in Vue JS when trying to set up a modular store

Efficiency levels of reach = within angular instructions

Progress tracking for async route guards in Vue router

Mocking a named class-export in TypeScript using Jest

Error: Access Denied (CSRF token not found or invalid) - despite being present

What is the best way to share a variable from a component in Vue.js?

Guide to implementing bidirectional data binding for a particular element within a dynamic array with an automatically determined index

Limit not reached by substring function

Limit on the number of users for organizations

Challenges with Validating Bootstrap Datepicker Functionality

encountering challenges while creating a multi-step registration form with Node.js, Express, and mongoDB

Is using setTimeout in a group of promises blocking in JavaScript?

Troubleshooting problem with displaying circular tag image below an image using Jquery

Middleware designed for logging in React, akin to Multer in the realm of Express JS

Vue.js Human Time Component Overwhelms CPU Usage

Utilize buttons to send data to a PHP script

NextJS Input Field causing a strange "Hydration Error indicating server HTML should not contain a <div> within a <form>", perplexingly occurring only in Chrome and exclusively on my personal computer

Retrieving dynamically created row from code-behind

A curious phenomenon observed in the behavior of the jQuery offset() method

Navigating through the sidebar on Next.js