prototypejs - Prototype $$ returns array, should return one element like $ -

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when using dollar-dollar-function in prototype alway array of elements back, instead of 1 element dollar-function. how can combine power of css-selectors of $$ still 1 element back?

changing structure of source not possible, can't select id. needs selected css, should return 1 element.

it not make sense return single element when selecting class name because potentially there many elements in dom have class. use first element of returned array if sure unique.

$$('.foo')[0]

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