first recurring
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let arr1 = [2,5,1,2,3,5,1,2,4];
let arr2 = [2,1,1,2,3,5,1,2,4];
let arr3 = [2,3,4,5];
let arr4 = [2,5,5,2,3,5,1,2,4];
//It should return 1
function firstRecurring(arr)
{
let hash = [];
for(let i of arr)
{
if(!hash[i])
hash[i] = [i,0];
else
return i;
}
}
console.log(firstRecurring(arr1));
console.log(firstRecurring(arr2));
console.log(firstRecurring(arr3));
console.log(firstRecurring(arr4));
JavaScript
INFO