JavaScript Math object

The Math object built into JavaScript provides us with several mathematical functions so we don't have to write them ourselves (imagine re-inventing sines and cosines from scratch!)

Some common functions include:

• Math.random()
  • gives us a random decimal number between 0 and 1 inclusive
• Math.abs(someNumberOrCalculation)
  • gives us the absolute value of a number or a calcuation, e.g.
    • -1 becomes 1
    • 2 just remains 2
    • -3+2 becomes 1
• Math.floor(someNumber)
  • gives us the integer that is less than or equal to some number, e.g.
    • 12.24 becomes 12
    • -1.37 becomes -2
    • 0 becomes 0
• Math.ceil(someNumber)
  • gives us the integer that is greater than or equal to some number, e.g.
    • 12.24 becomes 13
    • -1.37 becomes -1
    • 0 becomes 0
• Math.sqrt(x)
  • gives us the square root of x
• Math.pow(x, y)
  • gives us the "x to the power of y"
• Math.sin(x)
  • gives us the sine of x (in radians)
• Math.cos(x)
  • gives us the cosine of x (in radians)
• Math.tan(x)
  • gives us the tangent of x (in radians)
• Math.asin(x) + Math.acos(x) + Math.atan(x)
  • gives us the arcsine + arccosine + arctangent of x (in radians)
• Math.PI
  • gives us the approximation of pi (3.14159)
• Math.E
  • gives us the approximation to Euler's constant (2.718)