Convert array to a string

ArrayToString.js

// 1. Use .toString()
['a', 'b', 'c'].toString(); // 'a,b,c'

// 2. Coerce to string
['a', 'b', 'c'] + []; // 'a,b,c'
['a', 'b', 'c'] + ''; // 'a,b,c'

// 3. Use .join()
['a', 'b', 'c'].join(); // 'a,b,c' (defaults to ',' separator)
['a', 'b', 'c'].join(''); // 'abc'
['a', 'b', 'c'].join('-'); // 'a-b-c'

// 4. Use JSON.stringify()
JSON.stringify(['a', [1], 'b', 'c']); // '['a', [1], 'b','c']'

// 5. Manually, if can't use built-in method...
function arrayToString(arr) {
  let str = '';
  arr.forEach(function(i, index) {
    str += i;
    if (index != (arr.length - 1)) {
      str += ',';
    };
  });
  return str;
}

This code from William Vincent blog, JavaScript: Convert Array to a String