jQuery.map:jQuery.uniqueSort: Accept array-like input, fix typos

[mgol]

1. jQuery.map: Accept array-like input

2. jQuery.uniqueSort: Accept array-like input, fix typos

Apart from array-like inputs being officially allowed in
jQuery.uniqueSort now, in a few places in examples
it used to be referred to as unique instead of uniqueSort.

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The second one is particularly interesting. For some reason, there's even an example directly claiming jQuery.uniqueSort doesn't work on array-likes when its code says something completely opposite - especially that it's sometimes used on jQuery collections. We even test it on an "Arrayish" class!

[timmywil]

Are we sure this is true for all versions back to 1.0?

[mgol]

@timmywil I've just checked. In versions 1.0, 1.1, 1.2, 1.3, 1.4 & 1.5 jQuery.map is written using a for loop that would work with array-likes as well. Moreover, jQuery 1.2 implemented jQuery.fn.map which uses jQuery.map on jQuery objects which are not arrays.

jQuery 1.6 added support for iterating on objects in jQuery.map so it had to detect "arrays" separately. The 1.6 detection code is a bit cryptic:

// jquery objects are treated as arrays
isArray = elems instanceof jQuery || length !== undefined && typeof length === "number" && ( ( length > 0 && elems[ 0 ] && elems[ length -1 ] ) || length === 0 || jQuery.isArray( elems ) )

but it does detect array-likes. 1.9 extracted that logic and uses:

isArray = isArraylike( elems ),

so even the util name has "array-like" in the name.

I think we can assume that array-likes have been supported since 1.0 even if that was not the original intent.

[timmywil]

Thanks for looking at so many versions