How to filter an array/object by checking multiple values

I'm playing around with arrays trying to understand them more since I tend to work with them alot lately. I got this case where I want to search an array and compare it's element values to another array which contains values of some selected filters.

For example if I select 3 filters, I want later to write matches in new array - only those which match all 3 filters.

For easier understanding I set up an example on http://jsfiddle.net/easwee/x8U4v/36/

Code is:

var workItems =   [
    { "id": 2616, "category": ".category-copy .category-beauty .category-fashion"}, //this is a match
    { "id": 1505, "category": ".category-beauty"}, // NOT
    { "id": 1500, "category": ".category-beauty .category-fashion"}, // NOT
    { "id": 692, "category": ".category-stills .category-retouching"}, // NOT
    { "id": 593, "category": ".category-beauty .category-capture .category-fashion .category-product .category-stills .category-stills-retouching "}, // NOT
    { "id": 636, "category": ".category-beauty .category-copy .category-fashion"}, //this is a match
    { "id": 547, "category": ".category-fashion .category-lifestyle .category-stills .category-stills-retouching "}, // NOT
    { "id": 588, "category": ".category-capture .category-recent-work .category-copy .category-beauty .category-fashion"} //this is a match
];

var filtersArray = [".category-beauty", ".category-fashion", ".category-copy"];

var i;
for (i = 0; i < filtersArray.length; ++i) {
    var searchString = filtersArray[i];
    console.log('Searching for: ' + searchString);
    var filtered = $(workItems).filter(function(){
        return this.category.indexOf(searchString);
    });    
}   
console.log('Filtered results: ' + JSON.stringify(filtered, null, 4));

I also tried with

filtered = $.grep(workItems, function(element, index){
    return element.category.indexOf(filtersArray[i]); 
}, true);

but it matches only the first filter and only if it's at the begining of workItems.category

I've tried many different solutions but can't really make this work. What function should I use to return the desired result?

Answers:

Answer

You can use .filter() method of the Array object:

var filtered = workItems.filter(function(element) {
   // Create an array using `.split()` method
   var cats = element.category.split(' ');

   // Filter the returned array based on specified filters
   // If the length of the returned filtered array is equal to
   // length of the filters array the element should be returned  
   return cats.filter(function(cat) {
       return filtersArray.indexOf(cat) > -1;
   }).length === filtersArray.length;
});

http://jsfiddle.net/6RBnB/

Some old browsers like IE8 doesn't support .filter() method of the Array object, if you are using jQuery you can use .filter() method of jQuery object.

jQuery version:

var filtered = $(workItems).filter(function(i, element) {
   var cats = element.category.split(' ');

    return $(cats).filter(function(_, cat) {
       return $.inArray(cat, filtersArray) > -1;
    }).length === filtersArray.length;
});
Answer

You can use .filter() with boolean operators ie &&:

 var find = my_array.filter(function(result) {
       return result.param1 === "srting1" && result.param2 === 'string2';
       });
    return find[0];
 }

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