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/**

* @param {number[]} nums

* @return {number}

*/

var firstMissingPositive = function (nums) {

var hashmap = {};

for (var i = 0; i < nums.length; i++) {

if (nums[i] > 0) {

hashmap[nums[i]] = true;

}

}

// loop hashmap and find the first missing positive number

var n = 1;

while (true) {

if (!hashmap[n]) {

break;

} else {

n++;

}

}

return n;

};