Javascript-10-Math object

MATH

• Math.round;         // returns 3.141592653589793
• Math.round(4.7);    // returns 5
• Math.round(4.4);    // returns 4
• Math.pow(8, 2);      // returns 64
• Math.sqrt(64);      // returns 8
• Math.abs(-4.7);     // returns 4.7
• Math.ceil(4.4);     // returns 5
• Math.floor(4.7);    // returns 4

MATH Trignometry functions:

note: Angle in radians = Angle in degrees x PI / 180.

Math.sin(x) returns the sine (a value between -1 and 1) of the angle x (given in radians).

• Math.sin(90 * Math.PI / 180);// returns 1 (the sine of 90 degrees)

Math.cos(x) returns the cos(a value between -1 and 1) of the angle x (given in radians).

• Math.cos(0 * Math.PI / 180);// returns 1 (the cos of 0 degrees)

Math.min() and Math.max()

Math.min(0, 150, 30, 20, -8, -200);  // returns -200

Math.max(0, 150, 30, 20, -8, -200);  // returns 150

Math.random()

Math.random() returns a random number between 0 (inclusive),  and 1 (exclusive):

Math.random();     // returns a random number

Math Properties (Constants)

JavaScript provides 8 mathematical constants that can be accessed with the Math object:

1. Math.E        // returns Euler's number
2. Math.PI       // returns PI
3. Math.SQRT2    // returns the square root of 2
4. Math.SQRT1_2  // returns the square root of 1/2
5. Math.LN2      // returns the natural logarithm of 2
6. Math.LN10     // returns the natural logarithm of 10
7. Math.LOG2E    // returns base 2 logarithm of E
8. Math.LOG10E   // returns base 10 logarithm of E