The tricky part isn’t the syntax, it’s the domain knowledge. Well, actually it’s syntax, too. Swift has a whole lot of things that aren’t like anything else with sprinkles of Objective-C. Rust turns the common patterns upside down because they make borrow checker sad. But, in the end, what makes you a good engineer is knowing how to apply the tool to solve the problem and that goes well beyond syntax.

Programming languages are like different kinds of saws: all of them are made to cut things, but there are nuances. Some are replaceable, others can be used for one specific thing. Knowing how to operate a hacksaw gives you some idea how a chainsaw would work even though they are fundamentally different. But tinkle it this way: what are you trying to do? Answering that will tell you which saw you need to use.