solution0011.js

/*
8 kyu - Double Char
Given a string, you have to return a string in which each character (case-sensitive) is repeated once.

Examples (Input -> Output):
* "String"      -> "SSttrriinngg"
* "Hello World" -> "HHeelllloo  WWoorrlldd"
* "1234!_ "     -> "11223344!!__  "
*/
function doubleChar(str) {
    return str.split('').map(i => i + i).join('');
    }
    /*
    Sample Tests:
    
    describe("doubleChar", function() {
      it("works for some examples", function() {
        Test.assertEquals(doubleChar("abcd"), "aabbccdd");
        Test.assertEquals(doubleChar("Adidas"), "AAddiiddaass");
        Test.assertEquals(doubleChar("1337"), "11333377");
        Test.assertEquals(doubleChar("illuminati"), "iilllluummiinnaattii");
        Test.assertEquals(doubleChar("123456"), "112233445566");
        Test.assertEquals(doubleChar("%^&*("), "%%^^&&**((");
      });
    });
    
    */