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id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 68af0687ef34c76c28ffa547 | Challenge 30: Unique Characters | 28 | challenge-30 |
--description--
Given a string, determine if all the characters in the string are unique.
- Uppercase and lowercase letters should be considered different characters.
--hints--
allUnique("abc") should return true.
assert.isTrue(allUnique("abc"));
allUnique("aA") should return true.
assert.isTrue(allUnique("aA"));
allUnique("QwErTy123!@") should return true.
assert.isTrue(allUnique("QwErTy123!@"));
allUnique("~!@#$%^&*()_+") should return true.
assert.isTrue(allUnique("~!@#$%^&*()_+"));
allUnique("hello") should return false.
assert.isFalse(allUnique("hello"));
allUnique("freeCodeCamp") should return false.
assert.isFalse(allUnique("freeCodeCamp"));
allUnique("!@#*$%^&*()aA") should return false.
assert.isFalse(allUnique("!@#*$%^&*()aA"));
--seed--
--seed-contents--
function allUnique(str) {
return str;
}
--solutions--
function allUnique(str) {
let seen = '';
for (let char of str) {
if (seen.includes(char)) {
return false;
}
seen += char;
}
return true;
}