Rest parameters operator

See more on MDN

This operator packs multiple parameters into one array variable

not to get confused with spread syntax

function greet(spouseName, ...childrenNames){

console.log(\`\${spouseName} is my spouse\`);

//print only if non-empty array or second argument passed
if(childrenNames.length > 0)
console.log(\`Our children: \${childrenNames}\`);
const children = ['Al', 'Bill', 'Chloe'];
greet('Jane', children)
greet('Jane', 'Al', 'Bill', 'Chloe')
//will print twice:
// Jane is my spouse
// Our children: Al,Bill,Chloe