List number of documents in each collection

Hi, I’m tryng to list the count of documents for all colletions but my code doesn’t work:

use sample_training
for (var i = 0; i < collections.length; i++) {
    print(collections[i], db.getCollection(collections[i]).countDocuments())

I get this error:

ReferenceError: collections is not defined

What am I doing wrong?

this seems to work:

for (var i = 0; i < db.getCollectionInfos().length; i++) {
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