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1394-find-lucky-integer-in-an-array

DevGod
DevGod
Elf Vtuber
/**
* @param {number[]} arr
* @return {number}
*/
var findLucky = function(arr) {
return _.toPairs(
_.countBy(arr)
).filter(
(el)=>Number(el[0])==el[1]
).sort(
(el)=>-el[1]
)[0]?.[1] ?? -1
};