is F Sharp big in London City Finance center due to it can parallelize and Microsoft attracts the corporate world to functional programming popularity
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I think there are several reasons why F# has grown so quickly in popularity. The functional paradigm is particularly well-suited for parallel programming and data science, both of which have seen tremendous growth lately.
F# is both open source and backed by a heavyweight software company. This may be attractive to corporate technologists. I have to wonder if geography has a hand as well. With F# originating from the UK, and with London being probably the most significant center of finance in the world, it is not surprising that the banking/finance sector has been an early adopter.
A nice helpful as well to start learning
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