Constants

Morph provides const and constexpr for declaring immutable values.

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const — Runtime Constant

A const binding cannot be reassigned after initialization:

const MAX_HEALTH is 100;
const PI is 3.14159;

Attempting to reassign a constant produces a compiler error.

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constexpr — Compile-Time Constant

A constexpr value is evaluated entirely at compile time:

constexpr ComputeMax method() as int {
    return 255;
}

constexpr methods must produce a result computable at compile time with no side effects.

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Naming Convention

Constants must use UPPER_CASE naming when require_const_uppercase = true in .morphsettings:

const MAX_SPEED is 100;       // ✅ correct
const maxSpeed is 100;        // ❌ compiler warning/error

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const vs constexpr

Feature	const	constexpr
Evaluated	Runtime	Compile time
Reassignment	❌ Not allowed	❌ Not allowed
Used in methods	✅ Yes	✅ Yes (pure methods only)
Can call functions	✅ Any	Only constexpr functions

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Next Steps

• Operators — Arithmetic and comparison operators