Introducing object part 2

Object Properties



You can access object properties in two ways.objectName.propertyName
//or
objectName['propertyName']
This example demonstrates how to access the age of our person object.
var person = {
name: "John", age: 31,
favColor: "green", height: 183
};
var x = person.age;
var y = person['age'];Try It Yourself

JavaScript's built-in length property is used to count the number of characters in a property or string.
var course = {name: "JS", lessons: 41};
document.write(course.name.length);
//Outputs 2Try It Yourself

Objects are one of the core concepts in JavaScript.

Comments

Post a Comment

Popular posts from this blog

String Operators

Image
COURSES CODE PLAYGROUND DISCUSS TOP LEARNERS String Operators 39 1/1   String Operators The most useful operator for strings is  concatenation , represented by the + sign.  Concatenation can be used to build strings by joining together multiple strings, or by joining strings with other types:  var mystring1 = "I am learning "; var mystring2 = "JavaScript with SoloLearn."; document.write(mystring1 + mystring2); Try It Yourself The above example declares and initializes two  string  variables, and then concatenates them. Numbers in quotes are treated as strings: "42" is not the number 42, it is a  string that includes two characters, 4 and 2. What is the output of the following code: var x = "50"; var y = "100"; document.write(x+y); 50100 5000 Null 150
Read more

Introducing object part 3

Object Methods An  object   method   is a property that contains a  function definition . Use the following syntax to access an  object method . objectName.methodName() As you already know,  document.write() outputs data. The  write()  function is actually a  method  of the  document   object . document.write("This is some text"); Try It Yourself Methods are functions that are stored as  object  properties.
Read more

The math object part 2

Image
Math Object Methods The  Math   object  contains a number of methods that are used for calculations: For example, the following will calculate the  square root  of a number. var number = Math . sqrt (4); document.write(number); //Outputs 2 Try It Yourself To get a random number between 1-10, use  Math .random(), which gives you a number between 0-1. Then multiply the number by 10, and then take  Math .ceil() from it:  Math .ceil( Math .random() * 10).
Read more