Filtering an array by values that fall within the range of two other arrays can be achieved using JavaScript, especially

Within my possession are 2 arrays:

var array1 = 
[{"name":"abc", "url":"http:://example1.com"},
{"name":"cde", "url":"http:://example2.com"},
{"name":"fgh", "url":"http:://example3.com"}];

var array2 = 
[{"id":"1", "url":"http:://example1.com"},
{"id":"2", "url":"http:://example2.com"}]; 

My desire is to sift through array1 based on the url values present in array2, but I seem to be struggling with the methodology.

Kudos to VLAZ for the clarification on Array Definition. (I was under the impression my example would involve a 2-dimensional array).

While I am aware of the multi-object item in array2, I have employed the array2 reduction method to create new arrays. Yet, I yearn to delve deeper into the process of direct filtering between 2 arrays with multiple object items.

let array2b = array2.reduce((acc, cur) => [...acc, cur.url], []);
var filtered = array1.filter(item => array2b.includes(item.url));

UPDATE: After a day of fruitless searching, I unexpectedly stumbled upon a solution here: Filter array of objects with another array of objects . Apologies to all for the oversight

Answer №1

If you're working with ES6 JavaScript, there are convenient methods available to achieve this task. One approach is to utilize the .filter and .some functions.

To implement this in your scenario, consider the following code snippet:

var array1 = 
[{"name":"abc", "url":"http:://example1.com"},
{"name":"cde", "url":"http:://example2.com"},
{"name":"fgh", "url":"http:://example3.com"}];

var array2 = 
[{"id":"1", "url":"http:://example1.com"},
{"id":"2", "url":"http:://example2.com"}]; 

let filteredArray = array1.filter(firstItem => array2.some(secondItem => secondItem.url === firstItem.url)

Explanation: The filter method helps to create a new array with elements that satisfy a specific condition, while some functions as a validation check to determine if at least one element in array2 shares the same URL as the current element in array1.

Consequently, the code effectively filters array1 to only include objects whose URL matches those in array2.

For further insights, delve into these methods for a broader understanding of their utility within your context.

Trust this elucidates the matter.

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