Slot

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Says whether the Slot acts like a [[FinalSlot]] -- successive <code>[[#get/0|get]]()</code>s on the same slot will always give the same value.
Says whether the Slot acts like a [[FinalSlot]] -- successive <code>[[#get/0|get]]()</code>s on the same slot will always give the same value.
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<!-- so an FinalSlot acts like an write once read many memory, no? -~~~~ -->
Note that final implies read-only, but read-only does not imply final.
Note that final implies read-only, but read-only does not imply final.

Revision as of 22:07, 23 March 2008

A Slot is an object which provides the behavior of the binding of a noun. "&" in the E language allows working with slots.

A slot can also be considered a zero-dimensional collection, i.e. one which has exactly one element.

Contents

Notable implementations

Protocol

get/0

get() :any

Returns the current value of this slot.

put/1

put(newValue :any) :void

Sets the current value to the (possibly coerced) provided value, if appropriate for this type of slot; throws if not allowed.

isFinal/0

isFinal() :boolean

Says whether the Slot acts like a FinalSlot -- successive get()s on the same slot will always give the same value.

Note that final implies read-only, but read-only does not imply final.

readOnly/0

readOnly() :Slot

Returns a facet allowing get/0 but not put/1.

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