The JavaScript Diaries: Part 14

By Lee Underwood


Building the Right Environment to Support AI, Machine Learning and Deep Learning


Name Description
abs() Returns the absolute value of a number
acos() Returns the arccosine (in radians) of a number
asin() Returns the arcsine (in radians) of a number
atan() Returns the arctangent (in radians) of a number
atan2() Returns the arctangent of the quotient of its arguments
ceil() Returns the smallest integer greater than or equal to a number
cos() Returns the cosine of a number
exp() Returns Enumber, where number is the argument, and E is Euler's constant, the base of the natural logarithms
floor() Returns the largest integer less than or equal to a number
log() Returns the natural logarithm (base E) of a number
max() Returns the greater of two numbers
min() Returns the lesser of two numbers
pow() Returns base to the exponent power, that is, base exponent
random() Returns a pseudo-random number between 0 and 1
round() Returns the value of a number rounded to the nearest integer
sin() Returns the sine of a number
sqrt() Returns the square root of a number
tan() Returns the tangent of a number

Usage in Scripts

Let's see what we can do with some of these methods. (By now you can probably figure out these scripts without an explanation, so I won't go into greater detail. Instead, we'll focus on the methods themselves. Still, if a script begins to become complex, I'll stop and explain it. If you need further help, you can always e-mail me.)

Finding the Square Root

An obvious use is to find the square root of a number. Here's a basic script for doing the calculation:

This then would be called by the following, placed in the body of the document:

Rounding Numbers

Another calculation we could perform would be to round off a number. This script uses the code we wrote previously to find the circumfrence of a circle.

You could also use the round() method to set the number of decimal places:

The formula for rounding a number to x decimal points is:

  1. multiply the original number by 10^x (10 to the power of x)
  2. apply Math.round() to the result
  3. divide result by 10^x

Keep in mind that the format is as follows:

  1. Math.round(10*x)/10; (rounds to tenths)
  2. Math.round(100*x)/100; (rounds to hundredths)
  3. Math.round(1000*x)/1000; (round to thousandths)

Page 2 of 3

Previous Page
1 2 3
Next Page

Make a Comment

Loading Comments...

  • Web Development Newsletter Signup

    Invalid email
    You have successfuly registered to our newsletter.

    By submitting your information, you agree that htmlgoodies.com may send you HTMLGOODIES offers via email, phone and text message, as well as email offers about other products and services that HTMLGOODIES believes may be of interest to you. HTMLGOODIES will process your information in accordance with the Quinstreet Privacy Policy.

Thanks for your registration, follow us on our social networks to keep up-to-date