Flowdock
<<(p1) public

Append—Pushes the given object on to the end of this array. This expression returns the array itself, so several appends may be chained together.

   [ 1, 2 ] << "c" << "d" << [ 3, 4 ]
           #=>  [ 1, 2, "c", "d", [ 3, 4 ] ]
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