JS FAQ: Find out the most frequently occurring characters in a string.

First, the Loop obj

Let teststr = ' asdasddsfdsfadsfdghdadsdfdgdasd '; functionGetmax (str) {Let obj= {};  for(Let Iinchstr) {                if(Obj[str[i]]) {Obj[str[i]]++; }Else{Obj[str[i]]= 1; }} Let Keys= Object.keys (obj);//gets the value of all keys in the object return arrayLet values = object.values (obj);//get all value return arrayLet Maxval = Math.max (... values);//Math.max can find the maximum value of the incoming parameter, such as: Math.max, which can be used to deconstruct in ES6,
can also use Math.max.apply (math,values) can be considered as apply (Math.max, arr)
Arr is then a list of parameters, and for the Max method, its arguments are a number of numbers, i.e. Math.max (a, B, C, D, ...)Console.log (Keys[values.indexof (maxval)],maxval); } getmax (TESTSTR);//obj value: {a:5, s:7, D:12, F:4, G:2, H:1, S:7,}

Keys[values.indexof (maxval)] = The position of the largest number inside the value, and the key that corresponds to the maximum number position.

Maxval the largest number, that is, the number of times.

Str[i] is the first I character in the corresponding string,

Obj[str[i]] is the corresponding letter
The For loop is a key to the object that appears in obj, and then the loop determines if obj has an object with Str[i] as key, and if so, adds one to its value, indicating that the letter appears more often in obj; First I is the key name , Str[i] is the key value, which is used to do the key name of obj, and then assign, or accumulate

eg

Obj[str[i]] = 1;  =  = var obj={};obj.aa = 1;  Console.log (obj)

Second, the regular

Let Stringmax = (str) + =            {= Str.split ("). Sort (). Join (');             var s = Str.match (/(\w+) (\1)/g);             if NULL ) {                return str[0];            }             = S.map (E = e=e+e[0]);             var out = S.sort ((A, B) =>b.length- a.length);            Console.log (out[0][0],out[0].length);        Stringmax (TESTSTR)

JS FAQ: Find out the most frequently occurring characters in a string.