You only want to use the best tool you can and don't waste time. The frustation of using a language that slow you down can be very serious. Also, revist a bit the language A to see what's new before nothing.
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If A is Java forget it. Joke.
You only want to use the best tool you can and don't waste time. The frustation of using a language that slow you down can be very serious. Also, revist a bit the language A to see what's new before nothing.