FirstRecurringCharacter
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function firstRecurringCharacter(arr) {
const map = new Map();
for( i = 0; i < arr.length; i++) {
console.log(map[arr[i]]);
if(!map[arr[i]]) {
map[arr[i]] = true;
}
else {
return map[arr[i]];
}
}
return undefined;
}
console.log(firstRecurringCharacter([2,3,5,7,8,2]));
JavaScript
INFO