Assignment & Alias Semantics

In Morph, the default assignment behavior creates an alias — both names share the same memory.

Alias Assignment (Default)

When you assign one variable to another using is, they become aliases:

x is 10;
y is x;       // y is an ALIAS of x — shared memory

y is 20;      // x is now ALSO 20
Print(x);     // prints 20

This is fundamentally different from most languages. In Morph:

Alias-by-default avoids unnecessary copies, making the language fast by default. When you need a separate copy, you use another explicitly.

Reassigning with is updates the binding:

x is 10;
x is 20;      // x is now 20
x is "hello"; // ERROR: type mismatch (x is int)

Class field assignment uses is with dot notation:

node is Node();
node.value is 100;    // assign to field
Print(node.value);    // prints 100

Array/collection element assignment:

data[i] is data[i] * 2;

Inside class methods, use this to assign to own fields:

constructor public method(x as float, y as float) {
    this.x is x;
    this.y is y;
}

Language	`y = x` means...
C++	Copy the value
Python	Share the reference (for objects)
Morph	Alias — shared memory for all types

To get C++-style copy behavior in Morph, use another.