- Picking up where we left off
- Associative Arrays
- Learning about
- Math Object
- Number Object
- Date Object
- Using Associative Arrays
- Also referred to as hash tables
- Creating Custom properties
- Assign the tag MVP to one of the players on your roster.
- Math Properties
- Math Methods
- The Basic Methods
- The Two-Parameter Methods
- The Other Methods
- Number Object
- Number Object Properties
- Number Object Methods
- MAX_VALUE
- MIN_VALUE
- NaN
- NEGATIVE_INFINITY
- POSITIVE_INVINITY
- toExponential()
- toFixed()
- toPrecision()
- toSource()
- toString()
- valueOf()
- Date Object Properties
- Constructor
- prototype
- Date Object Methods
- A lot of them
- Consult pg. 328 – 329 for list
- Organize the Methods by their functions
- Get Values
- Set Values
- Other
Objectives of
Today’s SIG:
Arrays Con’t:
Using Associative
Arrays
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html
xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>PACS
JavaScript SIG</title>
</head>
<body>
<h1>PACS
JavaScript SIG/</h1>
<script
type="text/javascript">
// Usint
Associative Arrays
var positions = new
Array();
positions["3B"]
= "Kevin Fandsen";
positions["2B"]
= "Chase Utley";
positions["1B"]
= "Ryan Howard";
positions["SS"]
= "Jimmy Rollins";
positions["P"]
= "Roy Halladay";
positions["C"]
= "Sebastian Valle";
document.write("Playing
First Base is "+positions["1B"]+"</br>");
</script>
</body>
</html>
Math Object:
Like all Objects,
the Math Object has properties and Methods.
Here are some
examples of the Math Properites used during the SIG
<script
type="text/javascript">
var bob = 1
var math1 = bob *
Math.PI;
document.write("The
value of PI "+math1+"</br>");
//Use to calculate
area of a circle
var math2 = bob *
Math.E;
document.write("Euler's
Constant "+math2+"</br>");
/* It is the limit of (1 + 1/n)^n as n
approaches infinity, an expression that arises
in the study of
compound interest, and can also be calculated as the sum of the
infinite series[2]
*/
var math3 = bob *
Math.SQRT2;
document.write("The
value of PI "+math3+"</br>");
//square root of 2
is used in a 45degree triangle/pathagram theroy
</script>
We broke the Math
Methods into three different groups
<script
type="text/javascript">
var bob = 4.5;
var mathabs =
Math.abs(bob);
document.write("Here
is "+mathabs+"</br>");
var mathexp =
Math.exp(bob);
document.write("Here
is "+mathexp+"</br>");
var mathsqrt =
Math.sqrt(bob);
document.write("Here
is "+mathsqrt+"</br>");
var mathmx =
Math.max(mathabs,mathexp);
document.write("Here
is "+mathmx+"</br>");
var mathrnd =
Math.round(mathexp);
document.write("Here
is "+mathrnd+"</br>");
document.write("Here
is "+bob+"</br>");
</script>
Number Object:
Number Object
Properties:
<script
type="text/javascript">
// var num1 = 7.5
var num1 = new
Number(7.5);
var num2 = new
Number("127");
var num3 = new
Number("Bob");
// sets up variable
for display
var num3a =
Number.MAX_VALUE;
var num3b =
Number.MIN_VALUE;
var num3c =
Number.NEGATIVE_INFINITY;
var num3d =
Number.POSITIVE_INFINITY;
document.write("The
value of our variable is "+num1+"</br>");
document.write("The
value of our variable is "+num2+"</br>");
var num4=num1+num2
document.write(num4+"</br>");
document.write("The
value of our variable is "+num3+"</br>");
document.write("The
value of our variable is "+num3a+"</br>");
document.write("The
value of our variable is "+num3b+"</br>");
document.write("The
value of our variable is "+num3c+"</br>");
document.write("The
value of our variable is "+num3d+"</br>");
</script>
Number Object
Methods:
<script
type="text/javascript">
var
num1=145.27456789
document.write(num1.toExponential()+"</br>");
document.write(num1.toFixed(3)+"</br>");
//rounded to the
specific number of digits after the decimal
document.write(num1.toPrecision(3)+"</br>");
//total number of
characters not past decimal point
document.write(num1.toString()+"</br>");
</script>
Date Object:
<script
type="text/javascript">
var rightnow=new
Date();
var
theday=rightnow.getMinutes();
document.write("Today's
date is "+theday+"</br>");
</script>
