MaxChar

Directions

Given a string, return the character that is most commonly used in the string. If there is a tie, return null.
examples:

maxChar("abcccccccd") //--> "c"
maxChar("apple 1231111") //--> "1"
maxChar("edededed") // --> null

Solutions

JS

My Solution

function maxChar(str) {
    const charMap = {};
    let result;
    let hasTie = false;

    for (const char of str) {
        charMap[char] = charMap[char] + 1 || 1;

        if (!result) {
            result = char;
            continue;
        }

        if (charMap[char] > charMap[result] || char === result) {
            result = char;
            hasTie = false;
        } else if (char !== result && charMap[char] === charMap[result]) {
            hasTie = true;
        }
    }

    return hasTie ? -1 : result;
}

SG Solution 1

function maxChar(str) {
    const chars = {};
    let count = 0;
    let favChar = '';

    for (let char of str) {
        chars[char] = chars[char] + 1 || 1;
    }

    Object.keys(chars).forEach((key) => {
        if (chars[key] > count) {
            count = chars[key];
            farChar = key;
        }
    });

    return favChar;
}

SG Solution 2

function maxChar(str) {
    const charMap = {};
    let max = 0;
    let maxChar = '';

    for (let char of str) {
        if (charMap[char]) {
            charMap[char]++;
        } else {
            charMap[char] = 1;
        }
    }

    for (let [char, count] of Object.entries(charMap)) {
        if (charMap[char] > max) {
            max = charMap[char];
            maxChar = char;
        }
    }

    return maxChar;
}

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