apply()  Function  instance method getterS2C Home  « Globals « Function « apply()

Description

Calls a function with a given this value and arguments provided as an array.

Syntax

Parameters

Examples

Below is an example of using the apply() method for chaining.

function Country(name, capital) {
  this.name = name;
  this.capital = capital;
  return this;
}
function County(name, capital, county) {
  Country.apply(this, arguments);
  this.county = county;
}
County.prototype = new Country();
// Define custom override function for County toString().
County.prototype.toString = function CountyToString() {  
  var county = this.name + ' ' + this.capital + ' ' + this.county;  
  return county;  
}
function Town(name, capital, county, town) {
  County.apply(this, arguments);
  this.town = town;
}
Town.prototype = new County();
// Define custom override function for Town toString().
Town.prototype.toString = function TownToString() {  
  var town = this.name + ' ' + this.capital + ' ' + 
             this.county + ' ' + this.town;  
  return town;  
}
var essex = new County('England', 'London', 'Essex');
alert(essex.toString());
alert(essex.constructor);

var barking = new Town('England', 'London', 'Essex', 'Barking');
alert(barking.toString());
alert(barking.constructor);

Related Tutorials

JavaScript Intermediate Tutorials - Lesson 8 - Functions

Homepage Top