Values

Runtime bindings hold values; native function parameters use explicit machine types. Start with var and const, then use expressions to compute a new value.

Runtime values

Runtime values are null, bool, int, real, and string.

The recurloop_version phrase returns the running host's release version as a string, without a v prefix. It reads the host version on evaluation rather than storing a version in the language image:

var version = recurloop_version
print version

This prints the version exposed by the running language.

const project = "Recur" + "Loop"
var result = 2 + 3 * 4
result += 7

assert result == 21
print project + ": " + str(result)

Operators and precedence

Operator precedence, from highest to lowest:

1. unary !, ~, +, -;
2. *, /, %;
3. +, -;
4. <<, >>;
5. <, <=, >, >=;
6. ==, !=;
7. bitwise &;
8. bitwise ^;
9. bitwise |;
10. &&;
11. ||.

Primary and postfix syntax is phrase-backed too. The standard runtime-expression grammar declares grouping as a primary phrase and qualification, calls, and member calls as postfix phrases. Compiled fn expressions use the corresponding phrase dictionaries, so aliases of structural tokens work consistently in both paths instead of being recognized by spelling-specific parser branches.

Numeric and string behavior

Integer arithmetic checks overflow and division by zero. Mixed numeric operations produce real. String addition concatenates, and boolean operators short-circuit.

Bitwise operators require integers. ~ inverts bits, while &, |, and ^ combine bits. << shifts left, and >> shifts right arithmetically for signed types and logically for unsigned types. Shift counts are reduced modulo the left operand's bit width. Left shifts discard bits past that width. The top-level int has 64 bits. Compound assignments &=, |=, ^=, <<=, and >>= use the same operations.

Mutation and lexical scope

var is mutable, const is immutable, and assignment updates the nearest visible binding. Function bodies, branches, loops, and explicit blocks create lexical value scopes.