Handling Mathematical Constants in Javascript

by Geethalakshmi 2008-07-11 09:18:15

Some mathematical constants are predefined in JavaScript. You can write these constants as follows:

Math.PI // pi = 3.14159265...
Math.E // e = 2.71828182...
Math.LOG2E // log of e base 2
Math.LOG10E // log of e base 10
Math.LN2 // log of 2 base e
Math.LN10 // log of 10 base e
Math.SQRT2 // square root of 2
Math.SQRT1_2 // square root of 1/2

Thus, there is no need to remember the exact numerical value of e or pi. Just use Math.E or Math.PI!

JavaScript supports the following mathematical functions (methods of the Math object):

Math.abs(a) // the absolute value of a
Math.acos(a) // arc cosine of a
Math.asin(a) // arc sine of a
Math.atan(a) // arc tangent of a
Math.atan2(a,b) // arc tangent of a/b
Math.ceil(a) // integer closest to a and not less than a
Math.cos(a) // cosine of a
Math.exp(a) // exponent of a
Math.floor(a) // integer closest to and not greater than a
Math.log(a) // log of a base e
Math.max(a,b) // the maximum of a and b
Math.min(a,b) // the minimum of a and b
Math.pow(a,b) // a to the power b
Math.random() // pseudorandom number in the range 0 to 1
Math.round(a) // integer closest to a
Math.sin(a) // sine of a
Math.sqrt(a) // square root of a
Math.tan(a) // tangent of a

Trigonometric functions assume that the argument is in radians, not degrees!

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