The one that I use is
function isArrayLike(i){
return (typeof i !=="string") && i.length !== void (0);
}
It might not be perfect, but it allows me to make certain assumptions
about the input that are useful enough. Keep in mind that an Array may
have a length of 5, and all those values are undefined, so {length:4}
could be used as a valid arrayLike, and that seems reasonable to me.
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