1function sum(...numbers) {
2	return numbers.reduce((accumulator, current) => {
3		return accumulator += current;
4	});
5};
6 
7sum(1,2) // 3
8sum(1,2,3,4,5) // 15

1function addition(...nombre) {
2
3    let resultat = 0
4    
5    nombre.forEach(nombre => {
6       resultat+= nombre ;
7    }); 
8
9    console.log(resultat) ;
10    
11}
12
13addition(4 ,9 ,5 ,415 ,78 , 54) ;

1function multiply(multiplier, ...theArgs) {
2  return theArgs.map(element => {
3    return multiplier * element
4  })
5}
6
7let arr = multiply(2, 1, 2, 3)
8console.log(arr)  // [2, 4, 6]
9