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Java Introducing Lambdas

Posted by Ronnie N
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Ronnie N
Full Stack JavaScript Techdegree Student 102 Points

what is the "container" & "functional interface" referred to here at 4min 20seconds of the video?

Instructor said: forEach method on Collections: takes a consumer (newly introduced functional interface), consumer expects a parameter that takes one of its container's types.

What is this "newly introduced functional interface" and "container"?