I'd say it depends. If you are starting or maybe only learn a second language you should concentrate on one. But when you are at the point of having been exposed to 10 and more languages (ideally with different paradigms like OOP, FP an logic programming) it is usually easy to pick up new programming languages and learning/using multiple at a time is not as hard.
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I'd say it depends. If you are starting or maybe only learn a second language you should concentrate on one. But when you are at the point of having been exposed to 10 and more languages (ideally with different paradigms like OOP, FP an logic programming) it is usually easy to pick up new programming languages and learning/using multiple at a time is not as hard.