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In this section, we will consider a few problems where developers new to React often reach for inheritance, and show how we can solve them with composition.

In above sentence, the author used where to connect two sentence. I know that where means location. What's the usage of where in this sentence. Thank you!

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Where means more than just physical location - see definition 1b (MW)

at, in, or to what situation, position, direction, circumstances, or respect

So the statement you quoted could be re-phrased as

... we will consider a few problems in which the situation is that developers new to React ...

As you can see, it's much cleaner to just use "where".

  • what does in problems mean? – Micheal_Song Dec 8 '16 at 4:28
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Where is used here as a relative 'adverb' [I'd call it a pro-PP, PP standing for "preposition phrase"] with the antecedent a few problems. You may paraphrase

...a few problems in which developers [...] often reach for inheritance ...

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