Run results for: hgftyguhijokpl[;]

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Solution next day	37881.1 Ops/sec
Solution on interview	28735.9 Ops/sec

Script Preparation code:

const ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
const makeSet = () => {
    const count = Math.round(Math.min(Math.random() * 4 + 1, ALPHABET.length))
    let out = []
    for (let i = 0; i < count; i++) {
        let char
        do
            char = ALPHABET[Math.floor(Math.random() * ALPHABET.length)]
        while (out.includes(char))
        out.push(char)
    }
    return out.sort().join('')
}

const shuffleSet = (set) => {
    let out = ' '.repeat(Math.round(Math.random() * (set.length * 2) + 3))
    for (const char of set) {
        const count = Math.round(Math.random() * 3 + 1)
        for (let j = 0; j < count; j++) {
            const idx = Math.floor(Math.random() * out.length)
            out = out.slice(0, idx) + char + out.slice(idx)
        }
    }

    return out
}

const makeCase = () => {
    const filler = makeSet()
    let answer
    do {
        answer = makeSet()
    } while (answer === filler)
    answer = shuffleSet(answer)
    const count = Math.random() * 6 + 4

    const input = []
    for (let i = 0; i < count; i++)
        input.push(shuffleSet(filler))
    input.splice(Math.floor(Math.random() * input.length), 0, answer)

    return { input, answer }
}

var cases = [
    makeCase(),
    makeCase(),
    makeCase(),
]

Tests:

Solution next day
function findUniq(strings) { const uniq = {} for (let i = 0; i < strings.length; i++) { const l = new Set(strings[i].replace(/\s+/g, '').toLowerCase()).size uniq[l] = !(l in uniq) ? strings[i] : null } return Object.values(uniq).find(v => v) } for (const { input, result } of cases) console.assert(findUniq(input) === result)
Solution on interview
function findUniq(strings) { const s1 = strings.map((s) => s.toLowerCase().replaceAll(/\s/g, '')) const s2 = s1.map((s) => [...new Set(s)].sort().join('')) let out = [] for (let i = 0; i < s2.length; i++) { const elm = s2[i] if (out.some((idx) => s2[idx] === elm)) out = out.filter((idx) => s2[idx] !== elm) else out.push(i) } return strings[out[0]] } for (const { input, result } of cases) console.assert(findUniq(input) === result)

Run results for: hgftyguhijokpl[;]

Solution next day

Solution on interview