Juniper VLAN Interface vs IRB Interface

Hi All,

I'm still new to Juniper (I have a Cisco background though), and I'm trying to understand the difference between creating a VLAN interface, and attaching a VLAN to an IRB interface.

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For example:

set interfaces vlan unit 10 family inet address 10.10.10.10/24; 

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This appears to be the same as a Cisco SVI. This gives some layer-3 functionality to a VLAN.

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On the other hand:

set interfaces irb unit 10 family inet address 10.10.10.10/24; set vlans NAME vlan-id 10; set vlans NAME l3-interface irb.10; 

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This also appears to give a VLAN some layer-3 functionality.

So, I'm wondering what the difference between the two is. Is one for older versions and the other for newer versions? Are they different approaches to the same thing? Something else?

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Thanks