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Array.prototype.assoc = function(obj) { return ARR.find( function(iArr) { return iArr[0] == obj } ) }
const ARR = [ [ "a", "b", "c" ], [ 1, 2, 3 ], [ "a", 2 ] ]
ARR.assoc("a")
// > [ 'a', 'b', 'c' ]
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