Using $gt in mongodb

Question

I want to select all the documents in a collection that have 'age' property greater than a given age value.

Not working,

age: {
    $gt: given_age_value
}

Working fine,

age: {
    $gt: +given_age_value
}

What difference does the plus sign make? I can't find it in docs.

the + sign converts **given_age_value** (if it's something other than a valid number) to a number — taha, Jul 04 '17 at 09:00

Fetrarij · Accepted Answer · 2017-07-04T09:16:31.127

1

because the given_age_value is not a number (string may be) and adding + before makes it to a number.

{$gt: "1"} doesn't work

{$gt: 1} will work

{$gt: +"1"} will work

edited Jul 04 '17 at 09:16

answered Jul 04 '17 at 09:00

Fetrarij

Shouldn't {$gt: +"1"} work? – Sid24 Jul 04 '17 at 09:13
:D Wrong typo, exactly it works because the + makes it to a number – Fetrarij Jul 04 '17 at 09:17

1 Answers1