Math operators
The math operators are:
| Symbol | Action | Example |
|---|---|---|
+ |
add | |
- |
subtract | |
* |
multiply | |
/ |
divide | |
% |
remainder | |
** |
to the power of | |
++ |
adds 1 | myVar++ |
-- |
subtracts 1 | myVar-- |
+= |
Adds the current value to the value following | myVar += 10 |
-= |
Subtracts the current value from the value following | myVar -= 10 |
*= |
Multiplies the current value by the value following | myVar *= 10 |
/= |
Divides the current value by the value following | myVar *= 10 |
BIDMAS
Math calculations are performed in a set order: B I D M A S:
- brackets
- indices (power of)
- division
- multiplication
- addtion
- subtraction
Math functions:
There are lots of math functions:
Math.PI() // give pi 3.141592653589793
Math.round() // rounds a decimal number to it's nearest integer value
Math.ceil() // rounds a floating point number to it's highest integer value
Math.floor() // rounds a floating point number to it's lowest integer value
Math.pow(x, y) // multiplies x to the power of y.
Math.sqrt() // gets the square root of a number.
Math.abs() // gets the absolute value (ie positive). So -3 will be 3.
Math.sin() // the sine value of a number
Math.cos() // the cosine value of a number
Math.min(x, y, z) // finds the lowest number in a list
Math.max(x, y, z) // finds the highest number in a list
Math.random() // generates a random number between 0 and 1
To round a decimal to its nearest, lowest whole number:
let age = 20.589568
age = Math.Floor(age);
// output 20
random