JS Classic Case-arrow function hit the stars, palindrome number judgment

//user input number, according to the user's choice to print the stars//just playing the star function.Let Chooseone = line ={Let strspace= ""; Let Strstar= ""; //this layer for loop controls the number of rows of stars     for(Let I=1; i<=line; i++)    {        //the layer for loop controls the number of spaces         for(Let J=1; j<=line-i; J + +) {Strspace= Strspace + ""; }        //this layer for loop controls the number of stars         for(Let k=1; k<=2*i-1; k++) {Strstar= Strstar + ' * '; } console.log (Strspace+ Strstar);//print spaces and stars        //Reset the space and star stringsStrspace = ""; Strstar= ""; }}//hit the stars upside downLet Choosetwo = line ={Let strspace= ""; Let Strstar= ""; //this layer for loop controls the number of rows of stars     for(Let I=1; i<=line; i++)    {        //the layer for loop controls the number of spacesStrspace + = "";//Print space before printing a space specifically, in order to facilitate the printing of diamonds in the back         for(Let J=1; j<=i-1; J + +) {Strspace= Strspace + ""; }        //this layer for loop controls the number of stars         for(Let k=1;k<=line*2-(2*i-1); k++) {Strstar= Strstar + ' * '; } console.log (Strspace+ Strstar);//print spaces and stars        //Reset the space and star stringsStrspace = ""; Strstar= ""; }}//Hollow TrianglesLet Choosethree = line ={Let strspace= ""; Let Strstar= ""; //this layer for loop controls the number of rows of stars     for(Let i=1;i<=line;i++)    {        //the layer for loop controls the number of spaces         for(Let J=1; j<=line-i; J + +) {Strspace= Strspace + ""; }        //this layer for loop controls the number of stars         for(Let k=1; k<=2*i-1; k++)        {            //if it's the first line, or the last line or the first star or the last star            if(i==1 | | i==line | | k==1 | | k==2*i-1) {Strstar= Strstar + ' * ';//concatenation of strings inside *            }            Else{Strstar= Strstar + ";//concatenation of strings inside "'}} console.log (Strspace+ Strstar);//print spaces and stars        //Reset the space and star stringsStrspace = ""; Strstar= ""; }}//DiamondLet Choosefour = line ={Let top= parseint ((line+1)/2);//number of rows of the star to let bottom = line-top;//number of rows of the inverted star    //first, I'm hitting the stars.Chooseone (top); //Next, hit the stars upside down.choosetwo (bottom);}"Use Strict"Let readline= Require ("Readline-sync"); Console.log ("Please enter the graphic you want to print: 1. Playing the Stars 2. Hit the stars upside down 3. Hollow Triangle 4. Diamond (Odd)"); let choose= parseint (Readline.question ("")); Console.log ("Please enter the number of lines of stars:").= parseint (Readline.question (""));Switch(choose) { Case1: Chooseone (line);  Break;  Case2: Choosetwo (line);  Break;  Case3: Choosethree (line);  Break;  Case4: Choosefour (line);  Break; default: Console.log ("Your input is wrong");}

//Judging whether it is a palindrome numberLet ReadLine = require ("Readline-sync"); Console.log ("Please enter the number of palindrome you want to judge:"); let Oldnum= parseint (Readline.question (""));//number of 1234 to hold user inputLet newnum = 0;//used to hold the inverted number//assigns the number of user input backwards to newnum for(Let temp = oldnum;temp!=0; temp = parseint (TEMP/10))//temp 0{newnum= newnum*10 + temp%10;//4321 Why multiply it by 10? }if(Newnum = =oldnum) {Console.log ("is a palindrome number");}Else{Console.log ("Not a palindrome number.");}

JS Classic Case-arrow function hit the stars, palindrome number judgment