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/*
Description:
Given a string, you have to return a string in which each character (case-sensitive) is repeated once.
doubleChar(“String”) ==> “SSttrriinngg”
doubleChar(“Hello World”) ==> “HHeelllloo WWoorrlldd”
doubleChar(“1234!_ “) ==> “11223344!!__ ”
Good Luck!
*/
function doubleChar(str) {
return str.split(“”).map((letter) => `${letter}${letter}`).join(“”);
}
