Node array filtering not working

Question

I am trying to filter an array as I have a million times in the past but it's not working.

locations = city.locations.filter(
   (l) => {
     console.log(l._id);
     console.log(req.query.locationId);
     console.log(l._id === req.query.location);
     return l._id === req.query.location;
   }
)

Console output:

l1dr2jmg42lb2sgiudi
l1dr2jmg42lb2sgiudi
false

The first two console.log print identical strings but the third prints false??!?

I checked that city.locations is an Array and both l._id and req.query.locationId are a string.

Show your source data, actual results and desired results. Otherwise your question is off-topic. — hindmost
– hindmost, Commented Nov 16, 2016 at 10:14
Printing the string can hide undesired spaces before or after it. To make sure try console.log('"' + l._id + '"'). It is silly, but it happens. — DontVoteMeDown
– DontVoteMeDown, Commented Nov 16, 2016 at 10:15
@DontVoteMeDown I checked for spaces. None there. Makes no sense! — Mika
– Mika, Commented Nov 16, 2016 at 10:18
Out of interest if you change === to == in the 3rd console.log what do you get? — Jamiec
– Jamiec, Commented Nov 16, 2016 at 10:19

musikele · Accepted Answer · 2016-11-16 10:21:45Z

3

console.log(l._id === req.query.location);

you are not referring to req.query.locationId but toreq.query.location. Missing Id.

answered Nov 16, 2016 at 10:21

musikele

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3 Comments

Mika Over a year ago

Oh god! Let this SO page be witness of my shame for posterity!

DontVoteMeDown Over a year ago

@Mika perhaps its time for a break, go get some sleep. haha

musikele Over a year ago

Experience says that computers don't fail at string comparison, but humans do.

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