function sums(...numbers:number[]): number {
    let sum = 0;
    
    for (const number of numbers) {
        sum += number;
    }

    return sum;
}

console.log(sums(1,2,3,4)); // 10

function sum(...numbers:number[]): number {
    return numbers.reduce((a, b)=> a+b );
}

console.log(sum(5,6,4)); // 15