v1
- by nikkypizza 9/16/202000
Setup JavaScript
const testCases = [
{test: 'a',result: 'a'},
{test: 'abba',result: ''},
{test: 'sTreSS',result: 'T'},
{test: "Go hang a salami, I'm a lasagna hog!",result: ','},
{test: 'moonmen',result: 'e'},
{test: "hlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7ash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6ihlhlrhlhlrj8e4j8e4apw3tapw3tf7yaf7yaeocrdeocrd21w2k21w2k58jnb58jnbfpnfkfpnfk44wso44wsophfasphfash9e6ih9e6iz", result: 'z'},
{test: '∞§fi›fl∞§',result: 'fi'}
];
runTests = (cb) => {
testCases.forEach((item, index) => {
const result = cb(item.test);
if (result !== item.result) throw new Error(`Test ${index + 1}: expected ${item.result}, got ${result} instead.`)
});
}
ready
function firstNonRepeatingLetter(s) {
var lowerStr = s.toLowerCase();
var tempSet = new Set(lowerStr.split(''));
for (let it of tempSet) {
var firstIndex = lowerStr.indexOf(it);
var lastIndex = lowerStr.lastIndexOf(it);
if (firstIndex === lastIndex) return s[firstIndex];
}
return '';
}
runTests(firstNonRepeatingLetter);
ready
function firstNonRepeatingLetter(str) {
const lowerCaseStr = str.toLowerCase();
for (let i = 0; i < str.length; i++) {
const letter = lowerCaseStr[i];
if (lowerCaseStr.indexOf(letter) === lowerCaseStr.lastIndexOf(letter)) {
return str[i];
}
}
return '';
};
runTests(firstNonRepeatingLetter);
ready
const firstNonRepeatingLetter = (string) => {
const arr = string.toLowerCase().split('');
let result = arr.find(item => arr.indexOf(item) === arr.lastIndexOf(item)) || '';
if (result) {
result = string.includes(result.toUpperCase()) ? result.toUpperCase() : result;
}
return result;
};
runTests(firstNonRepeatingLetter);
ready
const firstNonRepeatingLetter = (string) => {
if (!string) {
return '';
}
if (string.length === 1) {
return string;
}
const arr = string.toLowerCase().split('');
let result = '';
const tmp = arr.reduce((acc, val) => {
acc[val] = acc[val] ? acc[val] + 1 : 1;
return acc;
}, {});
for (const [key, val] of Object.entries(tmp)) {
if (val === 1) {
result = key;
break;
}
}
return string.includes(result.toUpperCase()) ? result.toUpperCase() : result;
};
runTests(firstNonRepeatingLetter);