I could see it being useful when using grep or writing awk scripts. For the latter you usually have to carry around some state if you want to deduce the path to a desired leaf node.
I could also see it useful for just finding the index of a particular array entity.
because you cannot host jQuery on your own site, you may or may not need jQuery.
edit: turns out, adblock didn't like logger.js. but the jquery and underscores are still refusing to be served. You may or may not need underscore as well.
I could also see it useful for just finding the index of a particular array entity.