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A Tide program is usually a mix of relation definitions and query statements.

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query is how you “print”

Tide is currently side-effect-light: there isn’t a general-purpose print(...) builtin. Instead, you use query to evaluate an expression and display its result: 
query 1 + 2
query "hello"
query [x * x for x in 1..5]
In the REPL, each query shows you the computed value.

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Why this is nice

  • keeps programs readable
  • avoids IO semantics in the early alpha
  • makes examples and docs consistent
A real print (or logging) can come later once the semantics are nailed down.