Ember.streams.Ember.stream Class

Generate a new stream by providing a source stream and a function that can be used to transform the stream's value. In the case of a non-stream object, returns the result of the function.

The value to transform would typically be available to the function you pass to chain() via scope. For example:

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    var source = ...;  // stream returning a number
                           // or a numeric (non-stream) object
    var result = chain(source, function() {
      var currentValue = read(source);
      return currentValue + 1;
    });

In the example, result is a stream if source is a stream, or a number of source was numeric.