searchArray

const getGets = (arr) => {
    let index = 0;

    return () => {
        const toReturn = arr[index];
        index += 1;
        return toReturn;
    };
};
// this is the test
const test = [
    '4,3,2,7,8,2,3,1'
];

const gets = this.gets || getGets(test);
const print = this.print || console.log;

let numbers = gets().split(',').map(Number);
let count = numbers.length;
//let missing = [];

function missNums(numbers) {
    let missing = -1;
    let sorted = numbers.sort(function(a, b) {return a - b; });

    for (let i = sorted[0]; i <= numbers.length - 1; i++) {
        if (numbers.indexOf(i) === - 1) {
            missing = i;
        }
    }

}

// numbers.sort((a,b) => a - b);

// for (let i = 0; i < numbers.length; i++) {
//     if (numbers[i] === i) {
//         numbers.slice(i);
//     } else {
//         continue;
//     }
// }

// for (let i = 1; i < count; i++) {
//     if (numbers.indexOf(i) == -1) {
//         missing.push(i);
//     }
// }

print(numbers);
//print(missing);
print(missNums(numbers));