Web Reference: Here we're binding a value to the name x then using that binding inside another expression, x+1. We'll call this use of let a let expression. Since it's an expression it evaluates to a value. That's different than definitions, which themselves do not evaluate to any value. Currently supported “binding operators” are let and and, where is an operator symbol, for example and+$. Binding operators were introduced to offer convenient syntax for working with monads and applicative functors; for those, we propose conventions using operators * and + respectively. Ordinary non-recursive let is useful for re-defining values; especially handy when working interactively. But to write a recursive function, you need to use let rec.
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