Math Object
By: aathishankaran
For mathematical calculations, JavaScript encapsulates a
host of mathematical constants and procedures into a single entity-the Math
object. The Math object is quite a bit different from the other built-in
objects. First, you can perform basic arithmetic calculations (addition,
sub-traction, multiplication, and division) outside a Math object, so unless you
regularly require advanced math functions, you might rarely use it.
Few developers might need to tap into the true power of the
Math object, but for those who do, its capabilities are vital. Rather than pass
values back to the server to perform mathematical calculations, you can use the
Math object to perform advanced math processing on the client side.
Second, although you can create instances of String, Array,
and Date objects using new, you work with a built-in instance of the Math
object. This quality of the Math object parallels the Navigator object, for
example, which is not created on-the-fly. Consequently, the Math object is
commonly referred to as a static object.
Do not confuse the Math object as a "number"
object. The Math object is used for calculations only; it is not intended to be
used as a representative for a number as a String object is commonly used in
place of a string literal. It can be confusing because unlike the string, there
is no number object per se. A number (either an integer or floating point) is
recognized as a distinct data type, but it is not an object type.
The Math object's properties are really nothing more than a
list of common mathematical constants. Note the case of the constants. Although
nearly all JavaScript properties are typically lowercase or mixed case, these
properties are all uppercase.
Math
object properties
| Property | Returns | Description |
|
E LN2 LN10 LOG2E LOG10E PI SQRT1_2 SQRT2 |
2.718281828 0.693147181 2.302585093 1.442695041 0.434294482 3.141592654 0.707106781 1.414213562 |
Euler's constant Natural log of 2 Natural log of 10 Log base -2 of E Log base -10 of E Pi Square root of 0.5 Square
root of 2 |
| Method | Returns |
|
abs(value) acos(value). asin(vaJue) atan(value) ceil(value) cos(value) exp(value) floor(value) log(value) max(value1, value2) min(value1, value2) pow(value1, value2) random() round(value) sin(value) sqrt(value) tan(value) |
Absolute value of value Arc cosine of value (in radians) Arc sine of value (in radians) Arc tangent of value (in radians) Next integer >= value Cosine of value Euler's constant to the power of value Next integer <= value Natural logarithm of value (base e) The highest number of value1 or value2 The lowest number of value1 or value2 value1 to the value2 power A random number between 0 and 1 n + 1 (if value >= n.5; else n) Sine of value (in radians) Square root of value Tangent of value (in radians) |
Example:
<Html>
<Head><Title>Date Object</Title></Head>
<Body >
<H1>Math Object</H1>
<Hr>
<Script>
document.write("<B>");
document.write("<Br>");document.write("<Br>") ;
document.write("Absolute value of value : "+Math.abs(-10) ) ;
document.write("<Br>");document.write("<Br>") ;
document.write("Arc cosine of value (in radians) : "+Math.acos(.5) );
document.write("<Br>");document.write("<Br>") ;
document.write("Arc sine of value (in radians) : "+Math.asin(O.5) );
document.write("<Br>");document.write("<Br>");
document.write("Arc tangent of value (in radians) :"+Math.atan(0.5) );
document.write("<Br>");document.write("<Br>");
document.write ("Next integer >= value: "+Math.ceil(10.4));
document.write ("<Br>") ;document".write ("<Br>") ;
document.write("Cosine of value: "+Math.cos(90));
document.write ("<Br>") ;document.write("<Br>") ;
document.write(" Euler's constant to the power of value: "+Math.exp(5)) ;
document.write("<Br>");document.write("<Br>");
document.write ("Next integer <= value: "+Math.floor (10.4) ) ;
document.write("<Br>");document.write("<Br>") ;
document.write(" Natural logarithm of value (base e) :"+Math.log (20)) ;
document.write ("<Br>") ;document.write("<Br>");
document.write ("The highest number of value1 or value2 "+Math.max(9540, 10000));
document.write ("<Br>") ;document.write("<Br>");
document.write (" The lowest number of value1 or value2 : "+Math.min(500,450));
document.write ("<Br>") ;document.write("<Br>") ;
document.write(" value1 to the value2 power "+Math.pow(2,2));
document.write("<Br>");document.write("<Br>") ;
document.write("A random number between 0 and 1 :"+Math.random() );
document.write ("<Br>") ;document.write("<Br>");
document.write("n + 1 (if value >= n.5; else n) : "+Math.round(10.99) );
document.write ("<Br>") ;document.write("<Br>") ;
document.write(" Sine of value (in radians) "+Math.sin (90)) ;
document.write ("<Br>") ;document.write("<Br>");
document.write("Square root of value: "+Math.sqrt(9));
document.write ("<Br>") ;document.write ("<Br>") ;
document.write ("Tangent of value (in radians) "+Math.tan(90) );
document.write ("<Br>") ;document.write ("<Br>") ;
document.write("<hr>");
document.write("</B>");
</Script>
</Body>
</Html>
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