[Javascript] testArr.join(','), 배열을 특정 규칙으로 연결하기

const elements = ['Fire', 'Air', 'Water'];

console.log(elements.join());
// expected output: "Fire,Air,Water"

console.log(elements.join(''));
// expected output: "FireAirWater"

console.log(elements.join('-'));
// expected output: "Fire-Air-Water"

 

 

 

 

참고)

Array.prototype.join() - JavaScript | MDN