for each does not work on object array when you filter

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I m trying to get all the numbers from the list of all the contacts. Im probably not using forEach correctly any advice? I've put a sample of what is expected

 //sample of a contact
  Object {
"company": "Financial Services Inc.",
"contactType": "person",
"firstName": "Hank",
"id": "2E73EE73-C03F-4D5F-B1E8-44E85A70F170",
"imageAvailable": false,
"jobTitle": "Portfolio Manager",
"lastName": "Zakroff",
"middleName": "M.",
"name": "Hank M. Zakroff",
"phoneNumbers": Array [
  Object {
    "countryCode": "us",
    "digits": "5557664823",
    "id": "337A78CC-C90A-46AF-8D4B-6CC43251AD1A",
    "label": "work",
    "number": "(555) 766-4823",
  },
  Object {
    "countryCode": "us",
    "digits": "7075551854",
    "id": "E998F7A3-CC3C-4CF1-BC21-A53682BC7C7A",
    "label": "other",
    "number": "(707) 555-1854",
   },
 ],
},

//Expected
numbers = [
   5557664823,
   7075551854
]

//does not work 
const numbers = contacts.map(contact => contact.phoneNumbers.forEach(number));

forEach always returns undefined, so your map callback returns undefined, so numbers will be full of undefineds.

I think you probably want to return the phone numbers (each number in the phoneNumbers array of each entry), and then perhaps flatten the result:

const numbers = contacts.map(contact => contact.phoneNumbers.map(({number}) => number)).flat();

Array.prototype.flat is relatively new, but easily polyfilled.

That's such a common pattern that there's a flatMap method to do it in one go:

const numbers = contacts.flatMap(contact => contact.phoneNumbers.map(({number}) => number));

Or just a simple loop with push:

const numbers = [];
for (const {phoneNumbers} of contacts) {
    numbesr.push(...phoneNumbers.map(({number}) => number));
}

Array.prototype.filter(), Summary: in this tutorial, you will learn how to use the JavaScript Array filter() of the cities array object and passed into a function that tests each element. It is important to note that the filter() method does not change the original array. The filter() method is used in the JavaScript filter object. We can use the filter() method when we are dealing with an array of objects. JavaScript Filter Object. To filter an array of objects in JavaScript, use the Javascript filter() method. The filter() creates a new array with elements that fall under given criteria from the existing array.

Probably want to use reduce and map

let numbers = contacts.reduce((p, c, i) => {
    return p.concat(c.phoneNumbers.map(pn => pn.number));
}, []);

JavaScript Array Filter: Filtering Array Elements Based on a Test , Why my code is not working and I am getting error after so much hard work chain map and filter but you should be aware of what comes out of each to a new array of objects with two properties (title and rating), so the filter� Array#filter iterate over array, you don't need for inside filter. The problem with for inside filter is that it'll return the index of the element, which could be -1(truthy) if not found and anything upto the length of array. And only for the first element i.e. index zero, filter will not add the element as zero is falsey in JavaScript.

I don't know how many times I've done that. forEach doesn't return anything.

const numbers = contacts.reduce((n, c)=>(a.concat(contact.phoneNumbers)),[]);

or

const numbers = contacts.reduce((n, c)=>(a.concat(contact.phoneNumbers.map(pn=>pn.number)),[]);

Why my code is not working? Use the filter Method to Extract Data , I'm ok with your code, but what if I needed to match on every key ? In this case we are checking if the string does not include what you're checking for. data = data.filter(function (item) { console.log(Object.values(item)); return The Object. values method gives an array, so we can filter that, but in this� Introduction to JavaScript array filter() method. One of the most common tasks when working with an array is to create a new array that contains a subset of elements of the original array. Suppose you have an array of city objects where each object contains two properties: name and population.

Filter array of object - JavaScript, Where the `filters` argument is an object that contains a `key: string`. * and its value is a function with the value of the property to evaluate. * As the function predicate is evaluated using the `Array.prototype.every()` method, must be included or not in the filtered array. Thank you for this, just what I needed, excellent work!! The filter() method creates an array filled with all array elements that pass a test (provided as a function). Note: filter() does not execute the function for array elements without values. Note: filter() does not change the original array.

Filters an array of objects with multiple match-criteria. � GitHub, filter in React? I'll answer all of these questions plus show you some examples to get you started. The caveat here is that we're not actually filtering using React. Filter is a JavaScript function that we can perform on an array type object. So how do we filter an array of objects by value in React? App.js. forEach() executes the callback function once for each array element; unlike map() or reduce() it always returns the value undefined and is not chainable. The typical use case is to execute side effects at the end of a chain. forEach() does not mutate the array on which it is called.

React Filter: Filtering Arrays in React (With Examples), Return an array of all the values in the ages array that are 18 or over: var ages = [ 32, 33, Note: filter() does not execute the function for array elements without values. The array object the current element belongs to While using this site, you agree to have read and accepted our terms of use, cookie and privacy policy. i came across Get item where we have odata query wjere we could apply query based on some condition.But it unsuccessful when i am applying some condition using filter array. could you let me know the correct way to use it. the output is always 0.even though the condition matches.

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