I found a challenge on Codecademy about building a function that checks a string to see if all of the characters are unique. It seemed like a pretty straightforward challenge. Here is what I came up with using javascript:
function dupeCheck() {
var x = 'qsxthfeavyjkowmp'
var dupe = 0;
for (i = 0; i < x.length; i++) {
var letter = x.charAt(i);
var checker = x.indexOf(letter, i+1);
if (checker > 0) {dupe = dupe + 1;}
}
if (dupe > 0) {
alert("Duplicate Characters Were Found In Your String")
} else {
alert("Your string does not contain duplicate characters.")
}
}Originally, I was passing the string as a variable, but to turn it in, I switched it to a variable in the function. I think it’s pretty self explanatory. I’m taking each character in the string and checking to see if it appears again in the string. If it does, I add to the counter.