One lesson as the course overview sees it: its position in the module, its
title, its runtime and its artwork, and nothing more.
Remarks
durationSeconds is zero for reading lessons, which have no runtime, so
completion can still be derived from a saved playback position measured
against it. poster is absent — not undefined — for reading lessons,
whose schema has no such field.
One lesson as the course overview sees it: its position in the module, its title, its runtime and its artwork, and nothing more.
Remarks
durationSecondsis zero for reading lessons, which have no runtime, so completion can still be derived from a saved playback position measured against it.posteris absent — notundefined— for reading lessons, whose schema has no such field.