6.3.90.900
6 Functions
syntax
(function maybe-id (param-id ...) maybe-vars body ...+)
maybe-id =
| id maybe-vars =
| #:vars (var-id ...)
Produces an ECMAScript function. Each parameter param-id
is bound as a parameter in the ECMAScript environment, but is not
bound as a Racket variable.
If id is provided, it is the name of the function.
If maybe-vars is provided, each var-id is initialized as an ECMAScript variable binding.
Return early from the enclosing function. If expr
is provided it will be the return value. This form is illegal outside
of a function body.
syntax
Binds to the ECMAScript this value for the current
execution context.
procedure
(call ref arg ...) → (or/c value? void?)
ref : function? arg : value?
Invokes the function from ref. Each arg is bound
to a formal parameter of the function in order. Surplus arguments
are ignored, and if insufficient arguments are passed the remaining
parameters will be undefined.
The this value will be bound to the base of ref if it is a reference, or to the function itself otherwise.
procedure
(new ref arg ...) → object?
ref : constructor? arg : value?
Invokes ref as a constructor, with each arg
bound to a formal parameter. Surplus arguments are ignored, and
any remaining parameters are bound to undefined.
6.1 Function Predicates
| (require ecmascript/function) | package: ecmascript |
procedure
(function? v) → boolean?
v : any/c
Returns #t if v is an ECMAScript function,
#f otherwise.
procedure
(constructor? v) → boolean?
v : any/c
Returns #t if v is an ECMAScript function which
can be used in a new expression, #f otherwise.