Determining if a map array value is being duplicated with a distinct key in JavaScript

Question

Determining if a map array value is being duplicated with a distinct key in JavaScript

I am facing an issue with a Map that has "String" as keys and "Array" as values. My problem is figuring out how to check if an array item is present in a different "Array" value, specifically in the "Array" of a different key within the map.

For example:

var map = {
"KeyA" : [123,111,100],
"KeyB" : [147,123,789]
}

I need to find a way to determine if the array item 123 exists in two different arrays under keys KeyA and Key B.

Best regards, Abhi

javascript arrays collections hashmap iterator

Answer 1

Answer №1

You can develop a versatile function to verify values in arrays with the help of every():

let dictionary = {
  "KeyA" : [123,111,100],
  "KeyB" : [147,123,789],
  "KeyC" : [147,148,789]
};

let validator = (obj, keys, value) => {
  return keys.every(k => obj[k].includes(value));
}

console.log(validator(dictionary, ["KeyA", "KeyB"], 123));

If you need to pass an array of values:

let dictionary = {
  "KeyA" : [123,111,100],
  "KeyB" : [147,123,789,111],
  "KeyC" : [147,148,789]
};

let validator = (obj, keys, value) => {
  return keys.every(k => value.every(v => obj[k].includes(v)));
}

console.log(validator(dictionary, ["KeyA", "KeyB"], [123, 111]));

Answer 2

You can develop a versatile function to verify values in arrays with the help of every():

let dictionary = {
  "KeyA" : [123,111,100],
  "KeyB" : [147,123,789],
  "KeyC" : [147,148,789]
};

let validator = (obj, keys, value) => {
  return keys.every(k => obj[k].includes(value));
}

console.log(validator(dictionary, ["KeyA", "KeyB"], 123));

If you need to pass an array of values:

let dictionary = {
  "KeyA" : [123,111,100],
  "KeyB" : [147,123,789,111],
  "KeyC" : [147,148,789]
};

let validator = (obj, keys, value) => {
  return keys.every(k => value.every(v => obj[k].includes(v)));
}

console.log(validator(dictionary, ["KeyA", "KeyB"], [123, 111]));

Answer 3

Answer №2

To accomplish this task, we can utilize the Object.keys() method along with .filter, and then we will return the keys if the specified value is found in the array.

I have chosen to use indexOf() over includes() because the latter is not compatible with Internet Explorer without a polyfill.

const dataset = {
    "KeyA" : [123,111,100],
    "KeyB" : [147,123,789]
}

function identifyKeys(array, val) {
    return Object.keys(array)
        .filter(key => (array[key].indexOf(val) !== -1) ? key : null);  
}

console.log(identifyKeys(dataset, 123)); // [ 'KeyA', 'KeyB']

Answer 4

To accomplish this task, we can utilize the Object.keys() method along with .filter, and then we will return the keys if the specified value is found in the array.

I have chosen to use indexOf() over includes() because the latter is not compatible with Internet Explorer without a polyfill.

const dataset = {
    "KeyA" : [123,111,100],
    "KeyB" : [147,123,789]
}

function identifyKeys(array, val) {
    return Object.keys(array)
        .filter(key => (array[key].indexOf(val) !== -1) ? key : null);  
}

console.log(identifyKeys(dataset, 123)); // [ 'KeyA', 'KeyB']

Determining if a map array value is being duplicated with a distinct key in JavaScript

Answer №1

Answer №2

Similar questions

Removing a dynamic component in Angular

A function designed to retrieve all nearby values within a list

implementing a webpage enhancement that enables loading content asynchronously

Exploring the possibilities of custom layouts for specific routes within the pages directory in Next.js

Storing data with ElectronJS

Creating a Dropdown list using Javascript

What is the process of incorporating events into a calendar using jQuery or JavaScript?

Sequelize cannot locate the specified column in the database

Click on a div in AngularJS to be directed to a specific URL

Guide on dynamically updating a div in PHP with a mix of text output and images at regular intervals

I'm looking to add CSS transitions, like fade-ins, to a list of items in React in a way that the animations occur one after the other upon rendering. How can this be achieved?

Ways to extract a value from an HTML form in ASP.NET when using Html.EnumDropDownListFor

What is the best way to assign a PHP array to an Angular variable?

Struggling to find the right strategy for obtaining real-time data while implementing customized filters

New Relic identifies mysterious delays caused by MongoDB's findOne method

Getting the Tweets of a Twitter-validated user using node.js

AngularJS 2 - error when trying to bind inner properties: ERROR: Unable to access property value due to undefined variable

Perform individual conditions (filters) sequentially within a MongoDB query

Attempting to remove an attribute or property in JavaScript will not yield the desired result

The automation script for Playwright/Puppeteer is having trouble properly handling `async...await` in a `for..loop` on the `/signup` page