I cannot take seriously a programming language popularity index that states that Javascript has become significantly less popular in the last year. I'm no fanboy but given the sheer weight of evidence from language activity on sites like github to the incredible number of jobs and recruiters desperate for skilled javascript developers it just does not add up. Sometimes a metric producing an unexpected outlier means you've found something interesting but usually it means your metric is broken or meaningless. Searches for the word tutorial sounds like an increasingly meaningless metric the world of sites like stackoverflow.