Implement array.length - Githubissues

hughfdjackson / immutable

neatly packages immutable equivalents to JavaScript's Objects and Arrays.

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Implement array.length #1

Closed hughfdjackson closed 11 years ago

hughfdjackson commented 11 years ago

As a user, I expect any array-like object to expose the length via the .length property.

Acceptance:

Persistent Arrays expose length as an integer 1 greater than the highest integer key, as described http://es5.github.com/#x15.4.5.2.
length should be non-writable, since all 'mutation' should be achieved by the use of the .set and .remove/.delete keywords.