[brudgers]

What integration of the curriculum usually entails is bringing Language Arts and mathematics into other subjects. By analogy, if you want to integrate coding into primary school then you have to pick encodings that are integrable. Logo, Scratch, Python, C, Cobol, whatever aren't because you can't really use them in Language Arts without a real stretch of the term integration and a lot of pretending that Logo or Cobol isn't a force fit in a language arts class...it's hard to write a poem in Perl that compiles.

The way to integrate coding is to pick encodings that extend the ordinary tasks. The obvious extension of Language Arts is HTML because presentation is part of what primary schools teach and HTML is highly accessible and doesn't require any special tools.

The less obvious extension of mathematics is J, which is simply an alternative to languages designed for the limitations of 1970's era hardware in the form of hand calculators. Forty years ago, the hand calculator focused on accuracy over hand calculations rather than extending the possibilities of numerical manipulation. But summing a list of numbers should be a basic operation...and in mathematics it is - Σ.