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JavaScript: Math Library
"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
Note: All constants are named using UPPERCASE letters.
Methods:
| Method | Description |
|---|---|
| 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 |
Note: The method return a result that may be captured using assign operator "=" like in the example below:
let m = Math.max(5,2,14,10,8);
console.log(m); // 14
let a = Math.min(5,2,14,10,8);
console.log(a); // 2
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?
Read next: Frameworks