<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculate the number of occurrences of each character and which character appears most</title>
</head>
<body>
</body>
<script type="text/javascript">
//Calculate the number of occurrences of each character and which character appears most
let str = 'gggjjggyyyooppoooww';
function findString(str){
let StringNum = {};
//Traverse the string to get the object {character: number of occurrences}
for(let i=0;i < str.length;i++){
let e = str.charAt(i);
if(StringNum[e]){
StringNum[e]++;
}else{
StringNum[e] = 1;
}
}
console.log(StringNum);
let {maxArr,count} = {maxArr:[],count:0};
//Loop through the object to find the element with the most occurrences
for (let key in StringNum) {
//If there are more occurrences, you need to remove the previous element and add the current element
if (count < StringNum[key]) {
count = StringNum[key];
maxArr.shift();
maxArr.push(key);
}
//The number of occurrences is the same, add elements to the array
if (count == StringNum[key] && maxArr.indexOf(key) == -1) {
maxArr.push(key);
}
}
//Return object {array of high-frequency characters, maximum number of occurrences}
return {maxArr,count}
}
console.log(findString(str));
</script>
</html>
