filtering on arrays in arrays, is there an elegant way of doing this?

Question

This one has always served me well...

var myProperty = "FOO"

var expenseSelect = expenseArray.filter(function(obj){
    return obj.property == myProperty
});

But now I have a situation where the obj.property is an array of properties ["FOO", "BAR", "WEE"] inside the expenseArray.

Is there a smart way to do this? Or do I have to do the whole loop inside loop thing?

Recursion ? https://stackoverflow.com/questions/45796948/search-a-deeply-nested-value-in-array-of-objects-in-javascript — Suresh Atta, Aug 21 '17 at 13:06
There's no intrinsic mechanism for comparing arrays (or objects) based on content, so yes it's up to you to implement the comparison somehow. — Pointy, Aug 21 '17 at 13:06
Not sure, if I understood correctly, but shouldn't this work: `expenseArray.filter((obj) => obj.property.includes( myProperty ) )` ? — Sirko, Aug 21 '17 at 13:07
`expenseArray.filter(obj => obj.property.includes(myProperty))` — nem035, Aug 21 '17 at 13:07
@ꜱᴜʀᴇꜱʜᴀᴛᴛᴀ nice one!!! Didnt think that was possible hehe. A bit hackery but Im gonna try it out :) — torbenrudgaard, Aug 21 '17 at 13:08
Hmmm includes might just do it yes, that would be an easy solution - testing it and writing back — torbenrudgaard, Aug 21 '17 at 13:09

score 2 · Accepted Answer · answered Aug 21 '17 at 13:08

2

If you want to check if myProperty is in the array you can do it using

var myProperty = "FOO"

var expenseSelect = expenseArray.filter(function(obj){
    return obj.property.includes(myProperty);
});

answered Aug 21 '17 at 13:08

marvel308

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Marvel that did the trick! very elegant and simple, like it!! – torbenrudgaard Aug 21 '17 at 13:14

score 0 · Answer 2 · answered Aug 21 '17 at 13:14

using the some() method tests whether at-least one element in the array passes the test implemented by the provided function, it can be a simple an option..

var myProperty = "FOO";
var expenseArray=[];
expenseArray[0]={ property: ["FOO", "BAR", "WEE"] };
expenseArray[1]={ property: ["NoFOO", "BAR", "WEE"]} ;

var expenseSelect = expenseArray.filter(function(obj){
    return obj.property.some(function(element,index,array){
      return element == myProperty;
    });
});

console.log(expenseSelect);

filtering on arrays in arrays, is there an elegant way of doing this?

2 Answers2