Is it possible to employ variable data outside the function?

Question

Is it possible to employ variable data outside the function?

As a newcomer to programming, I understand that variables inside a function cannot be accessed outside of it. However, I am in need of the object stored in 'call'. Is there any way to extract data from this object? I have attempted declaring 'call' outside of the function but it remains empty.

function itemCollection(question, answer) {
  this.question = question;
  this.answer = answer;
}

const empty = new itemCollection('empty', 'empty');
const empty2 = new itemCollection('1', '2');

function randomitem() {
  let call = itemCollection[Math.floor(Math.random() * itemCollection.length)];
}

randomitem()
console.log(call);

The error:

Uncaught ReferenceError: call is not defined

javascript

Answer 1

Answer №1

If you're looking to retrieve a value, consider the following approach:

function itemCollection (query, result){
    this.query = query;
    this.result = result;
}
const nothing = new itemCollection('nothing', 'nothing');
const something = new itemCollection('1', '2');


function getRandomItem() {
     return itemCollection[Math.floor(Math.random() * itemCollection.length)];
}

let selection = getRandomItem()

console.log(selection);

Furthermore, for better optimization, it's advisable to make the getRandomItem function pure by passing all necessary arguments instead of relying on itemCollection as a global variable:

function getRandomItem(items) { 
     return items[Math.floor(Math.random() * items.length)];
}

let chosenOne = getRandomItem(itemCollection);

console.log(chosenOne);

Answer 2

If you're looking to retrieve a value, consider the following approach:

function itemCollection (query, result){
    this.query = query;
    this.result = result;
}
const nothing = new itemCollection('nothing', 'nothing');
const something = new itemCollection('1', '2');


function getRandomItem() {
     return itemCollection[Math.floor(Math.random() * itemCollection.length)];
}

let selection = getRandomItem()

console.log(selection);

Furthermore, for better optimization, it's advisable to make the getRandomItem function pure by passing all necessary arguments instead of relying on itemCollection as a global variable:

function getRandomItem(items) { 
     return items[Math.floor(Math.random() * items.length)];
}

let chosenOne = getRandomItem(itemCollection);

console.log(chosenOne);

Answer 3

Answer №2

Retrieve a value from a function, store it in a variable, and use the result

function itemCollection(question, answer) {
  this.question = question;
  this.answer = answer;
}

const empty = new itemCollection('empty', 'empty');
const empty2 = new itemCollection('1', '2');

function getRandomItem() {
  let call = itemCollection[Math.floor(Math.random() * itemCollection.length)];
  return call;
}

let result = getRandomItem();
console.log(result);

Answer 4

Retrieve a value from a function, store it in a variable, and use the result

function itemCollection(question, answer) {
  this.question = question;
  this.answer = answer;
}

const empty = new itemCollection('empty', 'empty');
const empty2 = new itemCollection('1', '2');

function getRandomItem() {
  let call = itemCollection[Math.floor(Math.random() * itemCollection.length)];
  return call;
}

let result = getRandomItem();
console.log(result);

Answer 5

Answer №3

To retrieve the value, simply return the result of randomitem

function randomitem() {
  return itemCollection[Math.floor(Math.random() * itemCollection.length)];
}

const call = randomitem();

Discover more about JavaScript scopes by reading this helpful article: https://codeburst.io/javascript-a-basic-guide-to-scope-9682d57be6fc

Remember to follow camelcase naming conventions for your variables and functions, such as function randomItem() {...}

Answer 6

To retrieve the value, simply return the result of randomitem

function randomitem() {
  return itemCollection[Math.floor(Math.random() * itemCollection.length)];
}

const call = randomitem();

Discover more about JavaScript scopes by reading this helpful article: https://codeburst.io/javascript-a-basic-guide-to-scope-9682d57be6fc

Remember to follow camelcase naming conventions for your variables and functions, such as function randomItem() {...}

Is it possible to employ variable data outside the function?

Answer №1

Answer №2

Answer №3

Similar questions

Saving form data with a tinymce textarea, radio button, and checkbox to the database

Unable to access socket.io due to a 404 error

Is it possible to iterate through HTML elements without relying on forEach()?

Retrieving information from subscription

Utilizing Bootstrap modal to insert data into phpMyAdmin database - a comprehensive guide

determining the preference between setTimeout and setImmediate

When using React, draggable components with input fields may lose their ability to receive focus when clicking on the input field

What methods can I use to stop the styles of a child component from impacting those of the parent component

How to retrieve an array value within a function in AngularJS

Executing Python script via AJAX or jQuery

Error in Typescript for a function that accepts several types of lists - property does not exist on the interface

Utilize the $slots property when working with v-slot in your Vue application

Use JavaScript to change the CSS pseudo-class from :hover to :active for touch devices

Storing extensive JSON data with AJAX, jQuery, and Java

What is the best method to calculate the total of multiple input values from various cells and display it in the final cell of an Angular table?

Discovering which chip has wrapped to the next line in Material UI Autocomplete can be found by closely inspect

Leverage a function in an external JavaScript file within Angular 4

Objective subject for an element within a :not operation

Using either Javascript or jQuery, I want to set a value within an if statement

Determine total number of covid-19 cases with JavaScript