Base of Java Script

  • The if else statment
  • The switch statment
  • The For Loop

The If else statment

The Switch Statment

var day = 2;
switch (day) {
  case 1:
    document.write("Monday");
    break;
  case 2:
    document.write("Tuesday");
    break;
  case 3:
    document.write("Wednesday");
    break;
  default:
    document.write("Another day");
}

// Outputs "Tuesday"

The Loop

For loop

for (i=1; i<=5; i++) {
   document.write(i + "<br />");
}

While loop

var i=0;
while (i<=10) {
   document.write(i + "<br />");
   i++;
}

Do… While loop

var i=20;
do {  
  document.write(i + "<br />");
  i++;  
}
while (i<=25); 

Break

for (i = 0; i <= 10; i++) {
   if (i == 5) {
     break; // The break statement "jumps out" of a loop and continues executing the code after the loop.

   }
   document.write(i + "<br />");
}

Continue

for (i = 0; i <= 10; i++) {
   if (i == 5) {
      continue; //The continue statement breaks only one iteration in the loop, and continues with the next iteration.
   }
   document.write(i + "<br />");
}

 

User Function

function my_function(arg1, arg2){
	//...
	var result = arg1 + arg2;
	return result;
	// If you do not return anything from a function, it will return undefined.
}

var print_sum = my_function(3, 2);
document.write(print_sum);

Objects

var person = {
	//property:value
	name: "Yury",
	age: 32,
	favColor: "Green",
	height: 172,
};

person.name
//or
person['age']

person.name.length
 function qwe(name, age, color) {
	this.name = name;
	this.age = age;
	this.favColor = color;
}
var vasia = new qwe('Vasia', 37, 'blue');
var petia = new qwe('Petia', 45, 'red');

document.write(vasia.name)
document.write("<br>")
document.write(petia.name)

 

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