7 Runtime System🔗ℹ

This library implements the JavaScript runtime system. It can be required via:

7.1 Namespaces🔗ℹ

7.2 Values🔗ℹ

All Scheme values are legal JavaScript values. A subset of Scheme values are designated as native JavaScript values. A native value is one of:

• void?: the JavaScript undefined value

• null?: the JavaScript null value

• boolean?: a JavaScript primitive boolean value

• string?: a JavaScript primitive string value

• number?: a JavaScript primitive number value

• object?: a JavaScript object

• function?: a JavaScript function

• array?: a JavaScript primitive array object

• wrapper?: a JavaScript object wrapping a primitive value

7.3 Objects🔗ℹ

The type object? is an opaque structure type. The types function?, array? and wrapper? are structure subtypes of object?. All objects carry an internal, mutable property table.

A property is one of:

• property-value?

• attributed?

Plain value properties are assumed to have no attributes. An attributed value may have any combination of the attributes DONT-ENUM?, READ-ONLY?, and DONT-DELETE?.

struct (struct   attributed (value attributes)

#:extra-constructor-name make-attributed)

value : value?

attributes : bit-set?

A bit-set is an efficient representation of a vector of booleans.

A property-value is one of:

• ref?

• value?

A ref is a special property with custom get, set, and delete behavior.

7.4 JavaScript Library🔗ℹ