19 lines
331 B
JavaScript
19 lines
331 B
JavaScript
/**
|
|
* @param {string} s
|
|
* @return {character}
|
|
*/
|
|
export const firstUniqChar = function (s) {
|
|
const due = new Set()
|
|
const queue = new Set()
|
|
for (const n of s) {
|
|
if (queue.has(n)) {
|
|
queue.delete(n)
|
|
due.add(n)
|
|
} else if (!due.has(n)) {
|
|
queue.add(n)
|
|
}
|
|
}
|
|
|
|
return Array.from(queue)[0] || ' '
|
|
}
|