pls help comparing two json array

json1 = [{'id':1,'name':pedro,'selected':''},{'id':2,'name':juan,'selected':''}, {'id':3,'name':john,'selected':''}];

Code (markup):

json2 = [{'id':1,'name':pedro},{'id':3,'name':john,'selected':''}];

Code (markup):

I want to check if the name value of json2 is exist in json1 then if exist modify the value of 'selected' keyname from json1 to 'true'.

Any idea? Please hekp thanks

 

You can always loop twice through the arrays, so possible code could be:

    json1 = [{'id':1,'name':'pedro','selected':''},{'id':2,'name':'juan','selected':''}, {'id':3,'name':'john','selected':''}];
    json2 = [{'id':1,'name':'pedro'},{'id':3,'name':'john','selected':''}];
    json1 = $.map(json1, function (n, i) {
        $.each(json2, function(j, val) {
            if (val.id == n.id) {
                n.selected = true;
                return false;
            }
        })
        return n;
    });
    console.log(json1);

Code (markup):

But, as you can see, it is not optimal. Your `json2` variable tells you if the object should be selected or not, so it would be lot better to reformat json2 into:

    json2 = {'1':true, '3':true};

Code (markup):

Then you can simplify the code and use:

    json1 = [{'id':1,'name':'pedro','selected':''},{'id':2,'name':'juan','selected':''}, {'id':3,'name':'john','selected':''}];
    json2 = {'1':true, '3':true};
    json1 = $.map(json1, function (n, i) {
        if (n.id in json2) {
            n.selected = true;
        }
        return n;
    });
    console.log(json1);

Code (markup):

Hope it helps