declare class javascript code example

Example 1: javascript class

class ClassMates{
	constructor(name,age){
    	this.name=name;
      	this.age=age;
    }
  	displayInfo(){
    	return this.name + "is " + this.age + " years old!";
    }
}

let classmate = new ClassMates("Mike Will",15);
classmate.displayInfo();  // result: Mike Will is 15 years old!

Example 2: javascript class example

// to create a class named 'LoremIpsum':

class LoremIpsum {
  
  // a function that will be called on each instance of the class
  // the parameters are the ones passed in the instantiation

  constructor(a, b, c) {
    this.propertyA = a;
    
    // you can define default values that way
    this.propertyB = b || "a default value";
    this.propertyC = c || "another default value";
  }
  
  // a function that can influence the object properties
  
  someMethod (d) {
    this.propertyA = this.propertyB;
    this.propertyB = d;
  }
}






// you can then call it
var loremIpsum = new LoremIpsum ("dolor", null, "sed");

// at this point:
// loremIpsum = { propertyA: 'dolor',
//                propertyB: 'a default value',
//                propertyC: 'sed' }

loremIpsum.someMethod("amit");

// at this point:
// loremIpsum = { propertyA: 'a default value',
//                propertyB: 'amit',
//                propertyC: 'sed' }







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Example 3: class declaration in javascript

class NameOfClass {
//class declaration first letter should be capital it's a convention
  obj="text";
  obj2="some other text";
}
//always call class with "new" key word
console.log(new NameOfClass);

Example 4: how to create class in javascript

class ClassName
{
	  
}