How to check whether multiple values exist within an Javascript array

Question

So, I\'m using Jquery and have two arrays both with multiple values and I want to check whether all the values in the first array exist in the second.

Answer 1

If you need a little bit more visibility on which items are in the array you can use this one :

var tools = {
        elem : {},
        arrayContains : function(needles, arrhaystack) {
           if (this.typeOf(needles) === 'array') {
                needle.reduce(function(result,item,$i,array){ // You can use any other way right there.
                    var present = (arrhaystack.indexOf(item) > -1);
                    Object.defineProperty(tools.elem, item, {
                        value : present,
                        writable : true
                    });
                },{})
                return this.elem;
            }
        },        
        typeOf : function(obj) {
            return {}.toString.call(obj).split(' ')[1].slice(0, -1).toLowerCase();
        }
    }

Use it with simply var check = tools.arrayContains([10,'foo'], [1,'foo','bar'])

Then you get the result like

10 : false
foo : true

Then if you need to get only one result if one of them is true you can :

arr = Object.values(check);
(arr.indexOf('true')) ? instru1 : instru2 ;

I don't think that's the better way but it's working & easily adaptable. Considering this example I advise you to make an Object.create(tools) before use it in your way.