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descriptionOverviewtimerResultssettingsSetupcodein Objectcodein DictionarycodeSet hascodehasOwnProperty ObjectcodehasOwnProperty DictionarycodeObject property !== undefinedcodeObject property !== undefinedcodeMap has

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Compare different methods of testing for the existence of a string value in a set of other strings. Primarily checking that "in" operator and dictionaries do not have performance cliffs.Description

inhashasownproperty

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