Array part 2

Accessing an Array



You refer to an array element by referring to the index number written in square brackets.
This statement accesses the value of the first element in courses and changes the value of the second element.var courses = new Array("HTML", "CSS", "JS");
var course = courses[0]; // HTML
courses[1] = "C++"; //Changes the second element
[0] is the first element in an array. [1] is the second. Array indexes start with 0.

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