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DataSnapshot.hasChildren() method

Returns whether or not the DataSnapshot has any non-null child properties.

You can use hasChildren() to determine if a DataSnapshot has any children. If it does, you can enumerate them using forEach(). If it doesn't, then either this snapshot contains a primitive value (which can be retrieved with val()) or it is empty (in which case, val() will return null).

Signature:

hasChildren(): boolean;

Returns:

boolean

true if this snapshot has any children; else false.