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JavaScript: math

JavaScript Math object allows you to perform mathematical tasks on numbers. The Math object includes several mathematical methods. You use Math using dot operator and name of the method. Also JavaScript provides 8 mathematical constants that can be accessed with the Math object.

Constants:

  • Math.E,
  • Math.PI,
  • Math.SQRT2,
  • Math.SQRT1_2,
  • Math.LN2,
  • Math.LOG2E,
  • Math.LOG10E

Notice all constants are using UPERCASE letters like in Level language.

Methods:

The method return a result that may be captured using assign operator “=” like in the example below:

MethodDescription
abs(x)Returns the absolute value of x
acos(x)Returns the arc-cosine of x, in radian
asin(x)Returns the arc-sine of x, in radian
atan(x)Returns the arc-tangent of x as a numeric value between -PI/2 and PI/2 radian
atan2(y,x)Returns the arc-tangent of the quotient of its arguments
ceil(x)Returns x, rounded upwards to the nearest integer
cos(x)Returns the cosine of x (x is in radian)
exp(x)Returns the value of Ex
floor(x)Returns x, rounded downwards to the nearest integer
log(x)Returns the natural logarithm (base E) of x
max(x,y,z,…,n)Returns the number with the highest value
min(x,y,z,…,n)Returns the number with the lowest value
pow(x,y)Returns the value of x to the power of y
random()Returns a random number between 0 and 1
round(x)Rounds x to the nearest integer
sin(x)Returns the sine of x (x is in radian)
sqrt(x)Returns the square root of x
tan(x)Returns the tangent of an angle

Homework: These particular two functions: (min & max) are curious. They can receive a variable number of arguments. How about this scenario: We have a bunch of numbers stored in an Array and we like to calculate min or max. Can we do it using Math functions?

The answer is in the next article: Collections