But Kotlin is the fastest-growing in percentage terms, and is likely to continue its quick growth due to Google’s preference for it for Android apps, SlashData said its latest half-year developer report.
Some 3 million developers began using the language from the fourth quarter of 2017 to the fourth quarter of 2019, the biggest growth in absolute terms of any language.
Python and Java
That includes both entry-level programmers and experienced developers, with the language popular for web applications, cloud services and extensions for third-party environments.
Python and Java have added nearly 4 million developers combined over the past two years, with Python adding 2.2 million net new developers in 2018 and surpassing Java in popularity.
In 2019 Python grew less quickly, but remains the second most widely used language, in part because of the rise of data science and machine learning.
Some 75 percent of machine learning developers and data scientists said they used Python, compared to less than 20 percent for R, a specialised programming language for statistical