What's the meaning of 'trim' when use in mongoose?

node.js mongodb mongoose trim
Undefined Behavior picture Undefined Behavior · Dec 24, 2013 · Viewed 26.6k times · Source

The link is http://mongoosejs.com/docs/api.html#schema_string_SchemaString-trim

I'm beginner in mongoosejs. I just don't get it...

I saw this question How to update mongoose default string schema property trim? but don't understand why trim. Im creating my first schema today like a 'hello world'.

I saw this to https://stackoverflow.com/tags/trim/info ... but when i need to use it, i want to learn more about it. Im looking for an explanation for a beginner...

Answer

Traveling Tech Guy picture Traveling Tech Guy · Dec 24, 2013

It's basically there to ensure the strings you save through the schema are properly trimmed. If you add { type: String, trim: true } to a field in your schema, then trying to save strings like " hello", or "hello ", or " hello ", would end up being saved as "hello" in Mongo - i.e. white spaces will be removed from both sides of the string.

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