predefined objectslet us assume some of the most

Question

Predefined Objects

Let us assume some of the most frequently utilized predefined objects provided in Javascript.

Math object

In most of the applications we have to perform calculations, whether this is accounting software or scientific software. Programmers are frequently typecast as good mathematicians. Every mathematician required a calculator sometimes, or in the particular case of JavaScript, the Math object. If we desire to calculate "2.5 to the power of 8" or "Sin0.9" in your script, then JavaScript's virtual calculator is what you desire. The Math object have a number of manipulating functions:

The Math object

Methods	Description
Math.abs(x)	Return absolute value of x
Math.acos(x)	Return arc cosine of x in radians
Math.asin(x)	Return arc sine of x in radians
Math.atan(x)	Return arc tan of x in radians
Math.atan2(x, y)	Counterclockwise angle among x axis & point (x,y)
Math.ceil(x)	Rounds a number up
Math.cos(x)	Trigonometric cosine of x (x in radians)
Math.exp(x)	Exponential method ex
Math.floor(x)	Rounds number down
Math.log(x)	Natural logarithm of x (base e)
Math.max(a, b)	Returns the larger of two values
Math.min(a, b)	Returns the smaller of two values
Math.pow(x, y)	Returns xy
Math.round(x)	Rounds x to the closest integer
Math.sin(x)	Trigonometric sine of x (x in radians)
Math.sqrt(x)	Square root of x
Math.tan(x)	Trigonometric tangent of x (x in radians)
Properties	Description
Math.E	Euler's constant ( ~ 2.718)
Math.LN10	Natural logarithm of 10 (~ 2.302)
Math.LN2	Natural logarithm of 2 (~ 0.693)
Math.LOG10E	Base 10 logarithm of Euler's constant (~          0.0434)
Math.LOG2E	Base 2 logarithm of Euler's constant (~1.442)
Math.PI	The ratio of a circle's circumference to its   diameter (~3.141)
Math.SQRT1_2	Square root of 0.5 ( ~ 0.707)
Math.SQRT2	Square root of 2.0 ( ~ 1.414)

 

Let us encompass Javascript perform some mathematical calculations: 

  //calculate e⁵                                                                                                                                      

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)

}