Spread operator for strings in JavaScript

The spread operator applied to a string splits that string character by character:

javascript...'abcde'; // will split the string into characters separated by commas:                 
                        //'a','b','c','d','e'

The result of such a split can be passed to the function parameters:

javascriptfunction func(s1, s2, s3, s4, s5) {
  return s1 + '-' + s2 + '-' + s3 + '-' + s4 + '-' + s5;
}

console.log( func(...'abcde') ); // shows 'a-b-c-d-e'

And you can convert this result to an array:

javascriptlet arr = [...'abcde']; // gets an array ['a', 'b', 'c', 'd', 'e']

javascriptlet arr = [...'12345'];
console.log(arr);

javascriptlet arr = ['a', ...'12345'];
console.log(arr);

javascriptlet arr = [...'12345', ...'56789'];
console.log(arr);

javascriptlet arr1 = ['a', 'b', 'c'];
let arr2 = [...arr1, ...'12345'];

console.log(arr2);