var theArr = Array.from({ length: 100000 }, (_, el) => el) var theSet = new Set(theArr) var theObject = Object.assign({}, ...theArr.map(num => ({ [num]: true }))) var theMap = new Map(theArr.map(num => [num, true])) var theTarget = 6500 function isTargetThereFor(arr, target) { const len = arr.length for (let i = 0; i < len; i++) { if (arr[i] === target) { return true } } return false } function isTargetThereForReverse(arr, target) { const len = arr.length for (let i = len; i > 0; i--) { if (arr[i] === target) { return true } } return false } function isTargetThereIncludes(arr, target) { return arr.includes(target) } // Set function isTargetThereSet(numberSet, target) { return numberSet.has(target) } // Object function isTargetThereHasOwnProperty(obj, target) { return obj.hasOwnProperty(target) } function isTargetThereIn(obj, target) { return target in obj } function isTargetThereSelectKey(obj, target) { return obj[target] } // Map function isTargetThereMap(numberMap, target) { return numberMap.has(target) }