how to properly filter an array in angular

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I have a service ice that pulls an array from the back-end, I need to get a single item from the array based on the ID, how do I do this in Angular?

I'm looking for how to do it specifically with angulars pipeable operators. Filter tends to just stop everything from working without throwing errors if not done correctly. I can get the the row info but I cant target the properties i get "Cannot read property 'id' of undefined"

I need to get a single item from the array based on the ID

try with Array.find()

let data = yourArray.find(x => x.id == "en-gb");

or try with array().filter().shift()

Please go through this below discussion

Difference between find() and filter().shift() on javascript

Angular filter Filter, The filter filter allows us to filter an array, and return an array containing only the matching items. This filter can only be used for arrays. Syntax. {{ arrayexpression |  You can check an example in Plunker over here plunker example filters. filter() { let storeId = 1; this.bookFilteredList = this.bookList .filter((book: Book) => book.storeId === storeId); this.bookList = this.bookFilteredList; }

angulars pipeable operators

I am not entirely sure what you mean by angulars pipeable operators. You have the tag rxjs-pipeable-operators in your question, so I expect you mean rxjs operators in general.

So I make the assumption on what you actually want to do. Please leave a comment if I missunderstood.

You have a service which returns an Observable from an array. Something like this:

function getMyData(): Observable<any[]> {
    return Observable.create(observer => {
        observer.next([
            { name: 'value 1', id: 1 },
            { name: 'value 2', id: 2 },
            { name: 'value 3', id: 3 }
        ]);

    });
}

If you want to modify the value in this observable stream, you cannot use filter or find on the stream directly. The value you receive is the full array, so the find operation is executed on the array object and not the individual items. What you want to do is to map the resulting value and filter it in the mapping function.

getMyData()
    .map((theArray: any[]) => theArray.find(item => item.id === 2))

AngularJS: Developer Guide: Filters, This filter reduces arrays into sub arrays based on conditions. The filter can be applied in the view template with markup like {{ctrl.array | filter:'a'}} , which would​  Filter is an important part in AngularJS as well as Angular 2 or Angular 4. It is basically used to filter an item from a group of items, which are there in an array or an object array. It selects a subset of the items from an array and returns it as a new array and this item is displayed on UI.

 this.booksByStoreID = this.books.filter(
      book => book.store_id === this.store.id);

How do I filter an array with TypeScript in Angular 2?

AngularJS: Different Ways of Using Array Filters, AngularJS provides a filter feature which can be used to format input value or to filter an array with the given matching input criteria. The item argument is a reference to the current element in the array as filter() checks it against the condition. This is useful for accessing properties, in the case of objects. If the current item passes the condition, it gets sent to the new array. Filtering an array of objects.

for single item from an array.

let selectedId = Array.find(a => a.id == 'fr-fr');

Learn about Filter components in AngularJS | Pluralsight, Learn about the different filter components in AngularJS and their implementation A filter returns a subset of a new array based on the conditions and The currency filter formats a number as currency, setting the number to the proper  Any filter arguments are passed in as additional arguments to the filter function. The filter function should be a pure function, which means that it should always return the same result given the same input arguments and should not affect external state, for example, other AngularJS services.

Array.prototype.filter(), The filter() method creates a new array with all elements that pass the test res.​length = c; // shrink down array to proper size return res; }; }  Filter an Array Based on User Input By setting the ng-model directive on an input field, we can use the value of the input field as an expression in a filter. Type a letter in the input field, and the list will shrink/grow depending on the match:

Everything about custom filters in AngularJS, Angular filters are one of the toughest concepts to work with. They're First, item previously is now items , which is our Array passed in from the  Filter from the list using input search form field. Use the checkbox to select a game from the populated list. Selected game tags will be added below the list items. Clear cross icon on search input to clear search term. “Clear Selection” to clear all selections by the user. An individual tag can be deleted using the cross icon on respective tags.

Filtering an array of objects : Angular2, Profer folder structure on bigger apps? [EDIT]: Proper*. I've been working with Angular for about a year now  function(value, index, array): A predicate function can be used to write arbitrary filters. The function is called for each element of the array, with the element, its index, and the entire array itself as arguments. The final result is an array of those elements that the predicate returned true for. comparator

Comments
  • better is if you post your code as well what have you tried so far
  • Possible duplicate of Javascript: How to filter object array based on attributes?
  • I'm looking for how to do it specifically with angulars pipeable operators. Filter tends to just stop everything from working without throwing errors if not done correctly. I can get the the row info but I cant target the properties i get "Cannot read property 'id' of undefined"
  • This is exactly what I needed thanks. I had needed to rewrite the code, filter had been working perfectly originally but with the rewrite it just stopped producing any results at all.