Get item index when using filter in javascript

Question

I'm using this code to get items that match a particular keyword.

var match_data = function(search_str, items) {
    var reg = new RegExp(search_str.split('').join('\\w*').replace(/\W/, ""), 'i');
    return items.filter(function(item_data) {
        if (item_data.match(reg)) {
            return item_data;
        }
    });
};

Is there any way I can get the index of the matched item as well ?

Also I keep getting this warning when my search string comtains \ anywhere in it:

Uncaught SyntaxError: Invalid regular expression: /iw*m\w*\/: \ at end of pattern(…)

Can you guys please help me solve this error as well.

Thanks in advance.

filter expect a boolean value, not the value of the item, if it should be inserted into the result set. — Nina Scholz
– Nina Scholz, Commented Nov 6, 2016 at 9:58
About index: you can use indexOf(val) function to get the index of value from the array. — Krzysiek Szymczak
– Krzysiek Szymczak, Commented Nov 6, 2016 at 9:59
@rakaz, this method won't work if you have 2 items with the exact same text in the list ( eg. var list = [ 'abc', 'def', 'abc', 'efg' ] ) — mrid
– mrid, Commented Nov 6, 2016 at 10:03

Nina Scholz · Accepted Answer · 2016-11-06 10:02:49Z

2

You could use another array and the index from the callback API of Array#filter.

var match_data = function(search_str, items) {
        var reg = new RegExp(search_str.split('').join('\\w*').replace(/\W/, ""), 'i'),
            indices = [];

        return {
            result: items.filter(function(item_data, index) {
                if (item_data.match(reg)) {
                    indices.push(index);
                    return true;
                }
            }),
            indices: indices
        };
    };

answered Nov 6, 2016 at 10:02

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

mrid Over a year ago

Thanks :) I'll give this a try and let you know

Collectives™ on Stack Overflow

Get item index when using filter in javascript

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related