text: {
    console.log('a',`\u0061`);
    console.log('s',`\u20BB7`);
  
    console.log('s',`\u{20BB7}`);
  
  
  }
  
  {
    let s='𠮷';
    console.log('length',s.length);
    console.log('0',s.charAt(0));
    console.log('1',s.charAt(1));
    console.log('at0',s.charCodeAt(0));
    console.log('at1',s.charCodeAt(1));
  
    let s1='𠮷a';
    console.log('length',s1.length);
    console.log('code0',s1.codePointAt(0));
    console.log('code0',s1.codePointAt(0).toString(16));
    console.log('code1',s1.codePointAt(1));
    console.log('code2',s1.codePointAt(2));
  }
  
  {
    console.log(String.fromCharCode("0x20bb7"));
    console.log(String.fromCodePoint("0x20bb7"));
  }
  
  {
    let str='\u{20bb7}abc';
    for(let i=0;i<str.length;i++){
      console.log('es5',str[i]);
    }
    for(let code of str){
      console.log('es6',code);
    }
  }
  
  {
    let str="string";
    console.log('includes',str.includes("c"));
    console.log('start',str.startsWith('str'));
    console.log('end',str.endsWith('ng'));
  }
  
  {
    let stu1 = ['ball', 'game', 'sleep', 'paint']
    let stu2 = ['eat', 'game', 'sleep']
    let test = 'paint'
    let test1 = 'eat'
    let tStu = []
    let stu = []
    for (var i = 0; i < stu1.length; i++) {
      console.log('test ', i, stu1[i].indexOf(test))
      console.log('test1 ', i, stu1[i].indexOf(test1))
      if(stu1[i].indexOf(test) !== -1) {
        tStu.push(test)
      }
    }
    console.log('tStu', tStu)
  
    // for (var i = 0; i < stu1.length; i++) {
    //   for (var j = 0; j < stu2.length; j++) {
    //     if(stu1[i].includes(stu2[j])) {
    //       stu.push(stu2[j])
    //     }
    //   }
    // }
    for (var i = 0; i < stu1.length; i++) {
      for (var j = 0; j < stu2.length; j++) {
        console.log(stu1[i].indexOf(stu2[j]))
        if(stu1[i].indexOf(stu2[j]) !== -1) {
          stu.push(stu2[j])
        }
      }
    }
    console.log(stu)
  }
  
  {
    let str="abc";
    console.log(str.repeat(2));
  }
  
  {
    let name="list";
    let info="hello world";
    let m=`i am ${name},${info}`;
    console.log(m);
  }
  
  {
    console.log('1'.padStart(2,'0'));
    console.log('1'.padEnd(2,'0'));
  }
  
  {
    let user={
      name:'list',
      info:'hello world'
    };
    console.log(abc`i am ${user.name},${user.info}`);
    function abc(s,v1,v2){
      console.log(s,v1,v2);
      return s+v1+v2
    }
  }
  
  {
    console.log(String.raw`Hi\n${1+2}`);
    console.log(`Hi\n${1+2}`);
  }
  