

The Math object
Programmers are often typecast as good mathematicians. While this is in fact
the case with me, I doubt it applies to everyone (small joke). As the scene
erupts in a sea of fury, lets just settle on the fact that every
mathematician needs a calculator sometimes, or in the case of JavaScript,
the Math object. Want to calculate "2.5 to the power of 8" or "Sin0.9" in
your script? JavaScript's virtual calculator is what you need.
Below lists all of Math's object's properties and methods:
Properties
Properties 
Description 
E 
The constant of E, the base of natural logarithms. 
LN2 
The natural logarithm of 2. 
LN10 
The natural logarithm of 10. 
LOG2E 
Base 2 logarithm of E. 
LOG10E 
Base 10 logarithm of E. 
PI 
Returns PI. 
SQRT1_2 
Square root of 1/2. 
SQRT2 
Square root of 2. 
Methods
Methods 
Description 
abs(x) 
Returns absolute value of x. 
acos(x) 
Returns arc cosine of x in radians. 
asin(x) 
Returns arc sine of x in radians. 
atan(x) 
Returns arc tan of x in radians. 
atan2(y, x) 
Counterclockwise angle between x axis and
point (x,y). 
ceil(x) 
Returns the smallest integer greater than
or equal to x. (round up). 
cos(x) 
Returns cosine of x, where x is in radians. 
exp(x) 
Returns e^{x} 
floor(x) 
Returns the largest
integer less than or equal to x. (round down) 
log(x) 
Returns the natural
logarithm (base E) of x. 
max(a, b) 
Returns the larger of a and b. 
min(a, b) 
Returns the lesser of a and b. 
pow(x, y) 
Returns X^{y} 
random() 
Returns a pseudorandom number between 0 and
1. Example(s). 
round(x) 
Rounds x up or down to the nearest integer.
It rounds .5 up. Example(s). 
sin(x) 
Returns the Sin of x, where x is in
radians. 
sqrt(x) 
Returns the square root of x. 
tan(x) 
Returns the Tan of x, where x is in
radians. 
Let's have JavaScript solve some mathematical problems that
have baffled mankind for ages:
//calculate e^{5}
Math.exp(5)
//calculate cos(2PI)
Math.cos(2*Math.PI)
The "with" statement
If you intend to invoke Math multiple times in your
script, a good statement to remember is "with." Using it you can omit the
"Math." prefix for any subsequent Math properties/methods:
with (Math){
var x= sin(3.5)
var y=tan(5)
var result=max(x,y)
}
And with that the tutorial comes to a wrap. Have fun
crunching some numbers!
