I haven't done a lot of mobile development, but portable languages --- ones that work across multiple platforms --- will always be easier to maintain, and less prone to fade out of support than platform-centric languages. That's true in any domain.
However, I don't recommend JavaScript for app development, so called "hybrid apps." That's an entirely separate topic, wherein you're creating an app as a glorified website. Some people love it (I hate it), but it's a topic unto itself.
I'm instead talking about native app development. Look into languages like C#, Python, or C++. These are consistently towards the front of the pack for mobile development, especially because they work on everything (more or less).
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I haven't done a lot of mobile development, but portable languages --- ones that work across multiple platforms --- will always be easier to maintain, and less prone to fade out of support than platform-centric languages. That's true in any domain.
However, I don't recommend JavaScript for app development, so called "hybrid apps." That's an entirely separate topic, wherein you're creating an app as a glorified website. Some people love it (I hate it), but it's a topic unto itself.
I'm instead talking about native app development. Look into languages like C#, Python, or C++. These are consistently towards the front of the pack for mobile development, especially because they work on everything (more or less).