The question is to split string in such a way that each element in the array has two characters and if the length of the string is odd then the missing character should get replaced by '_'.
output: ["ab", "c_"]
output: ["ab", "cd"]
So the single line solution is:
const splitString2 = (str) => str.concat('_').match(/../g);
String.prototype.match() takes parameters as regular expressions object and returns an array whose value depends on presence and absence of
g flag. The
g flag returns all results matching the
The dot(.) in regex represents any character except newline. Therefore,
/../g represents two characters to match.