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You should use filter method, which accepts a callback function. The filter () method creates a new array with all elements that pass the test implemented by the provided function. Also, use typeof operator in order to find out the type of item from array. The typeof operator returns a string indicating the type of the unevaluated operand.
The shape of the filter_list was only a suggestion, so that it is readable. I wouldn't call the filters filter_1, filter_2, etc. but in such a way, that it's clear what the purpose of the filter is. Within each filter it should be clear what column of the data.frame is targeted and what values are selected.
You create your filter over A:G by condition of K:K, like you had and you filter the result for the columns in your filtered range being equal to the given columns.