{"ScriptPreparationCode":"var entries = new Array(1000).fill(0).map((_, i) =\u003E [\u0027id_\u0027\u002Bi, true]);\r\nvar obj = Object.fromEntries(entries);\r\nvar map = new Map(entries);","TestCases":[{"Name":"Lookup Map","Code":"let hasKey = map.has(\u0027id_900\u0027);","IsDeferred":false},{"Name":"Object dot","Code":"let hasKey = !!obj[\u0027id_900\u0027];","IsDeferred":false},{"Name":"Object in","Code":"let hasKey = \u0027id_900\u0027 in obj;","IsDeferred":false}]}