PROGRAM STRUCTURE

PROGRAM STRUCTURE

1. Variables

   • Initialize: var tenbien = value;

2. Comment: // hoac /**/

3. I/O function basic

   • console.log("text"): hien thi tren console
   • alert("text"): hien thi thong bao
   • confirm("Are you sure?") --> return true - click OK, false - click Cancel
   • prompt("Nhap so", "so la..."): parameter1 cau y/c user nhap, para2 hien thi trong textinput

4. if-else

   • if(condition){//do sth}
   • if(condition) {//do sth} else {//do sth}

5. loop

   • while (condition) { code block to be executed }
   • do { code block to be executed } while (condition);
   • for (statement 1; statement 2; statement 3) { code block to be executed }
     • statement1: is executed before the loop starts, chi use 1 lan
     • statement2: dk dung
     • statement3: gtri lap
   • var person = {fname:"John", lname:"Doe", age:25}; var text = ""; var x; for (x in person) { text += person[x]; }

6. switch-case

   • switch(expression) { case n: code block break; case n: code block break; default: default code block }
   • how it work
     • switch expression is evaluated once
     • ss expression = vs case ko
     • if = -> thuc hien code trong case
   • default: code to run if there is no case match