[JS] string padding(패딩)

const string_1 = '1';
console.log(string_1.padStart(3, '0'));
// output: "001"

const string_2 = '2';
console.log(string_2.padStart(4, '*'));
// output: "***2"

const string_3 = '3';
console.log(string_3.padEnd(5, '0'));
// output: "30000"

const string_4 = '4';
console.log(string_4.padEnd(6, '*'));
// output: "4*****"