I strongly believe that the only way to make them grasp the basic concepts is by showing them. I did not like the way we spend hours of lectures learning the theory only to be introduced to practicals mid-semester. For every theoretical concept you have, follow it up with a practical case scenario or even code. Seeing is believing
ALWAYS keep in mind that you are talking to beginners. Patience is key. Explain everything without assuming that they know something even if they do.
For students with some programming experience
Relate your lecture to the languages or concepts they already know. This makes them feel like they are adding to their body of knowledge rather than learning a new concept from scratch. Also remember to outline the differences between the 'language style' they know with the 'javascript style'
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For absolute beginners,
For students with some programming experience