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πŸ“„ Find Most Frequent Char

Question Description​

建立一個 function,ζŽ₯ζ”ΆδΈ€ε€‹ε­—δΈ²οΌŒδΈ¦ε›žε‚³θ©²ε­—δΈ²δΈ­ε‡ΊηΎζ¬‘ζ•Έζœ€ε€šηš„ε­—ε…ƒγ€‚

1. JavaScript Version​

function findMostFrequentChar(str) {
// init object to store char and count
const charCount = {};

// init record of max count and char variable
let maxCount = 0;
let maxChar = '';

// loop through string
for (let char of str) {
// if char is not in object, set count to 0
if (!charCount[char]) {
charCount[char] = 0;
}

// increment this char count + 1
charCount[char]++;

// if this char count is greater than max count
// update max count and max char
if (charCount[char] > maxCount) {
maxCount = charCount[char];
maxChar = char;
}
}

// return max char
return maxChar;
}

console.log(findMostFrequentChar('abcccccccd')); // c