I am mostly interested in the Dynamic and Open Source languages so there is no Java and C# and Objective-C in this comparison. There are two tools I've used. Google Trends and Alexa. Last year I had a similar report.
Google TrendsLooking at the data during 2014 for the 5 major dynamic programming languages, this is what we get: January 2014 % PHP 95 36.5 Javascript 68 26.1 Python 47 18.0 Ruby 40 15.3 Perl 10 3.8 TOTAL: 260 December 2014 % PHP 89 35.1 JavaScript 61 24.1 Python 48 18.9 Ruby 47 18.5 Perl 8 3.1 TOTAL: 253 The interesting part is the relative weight of these 5 languages among themselves. This is what we see in the second column. The percentage of searches for the specific terms out of all the searches for any of these 5 terms. I was surprised to see Ruby growing and JavaScript shrinking in relative popularity.
The most popular web sites based on Alexa rankingAre the Alexa ranking meaningful? See the correlation to what Google Analytics reports. The most popular site in each of the above languages:
Full list of the popularity indexes: List of curated weekly newsletters for these languages. Published on 2015-01-14 by Gabor Szabo
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