Hi everybody, I'm Aya Bouchiha, and this is your complete guide to Math object in Javascript!

Math Object

Firstly, we need to know that Math is a built-in object, It works with Number type and not with BigInt. In addition, It is not a constructor. All its properties and its methods are static.

Math.floor()

Math.floor(number) : rounds a number down and returns an integer value.

/* rounds a number down  */
console.log(Math.floor(2.4)) // 2
console.log(Math.floor(1.999999)) // 1
console.log(Math.floor(10.5)) // 10

Math.ceil()

Math.ceil(number) : rounds a number up to the next largest integer.

/* rounds a number up to the next largest integer  */
console.log(Math.ceil(0.000000000000000001)) // 1
console.log(Math.ceil(0) )// 0
console.log(Math.ceil(10.5)) // 11

Math.random()

Math.random() : returns a random number where 0 <= Math.random() < 1

/* get a random number n where 0 <= n < 1 */
console.log(Math.random()) //  0.3594237846698176

// Returns a random integer from 0 to 50:
console.log(Math.floor(Math.random() * 50)) // 43

Math.round()

Math.round(number) : rounds to the nearest integer

/* rounds to the nearest integer  */
console.log(Math.round(0.2)) // 0
console.log(Math.round(10.5)) // 11
console.log(Math.round(1.9) )// 2

Math.trunc()

Math.trunc(number) : returns the integer part of a number by removing any fractional digits.

/*  get the integer part of a number */
console.log(Math.trunc(1.000000001)) // 1
console.log(Math.trunc(10.5)) // 10
console.log(Math.trunc(4.999999)) // 4

Math.sign()

Math.sign(number) :indicate the sign of a numeber. If the num is:

negative : returns -1
0 : returns 0
positive : returns 1

/*  get the sign of a number  */
console.log(Math.sign(-4.5)) // -1
console.log(Math.sign(0)) // 0
console.log(Math.sign(10)) // 1

Math.pow()

Math.pow(base, exponent) : returns base^exponent.

/*  get the value of a num1 to the power of a num2  */
console.log(Math.pow(2,3)) // 8
console.log(Math.pow(1,10)) // 1
console.log(Math.pow(10,3)) // 1000

Math.sqrt()

Math.sqrt(num) : returns the square root of a number.

/*  get  the square root of a number. */
console.log(Math.sqrt(16)) // 4
console.log(Math.sqrt(100)) // 10
console.log(Math.sqrt(25)) // 5

Math.cbrt()

Math.cbrt(num) : returns the cubic root of a number.

/*  get  the cubic root of a number. */
console.log(Math.cbrt(8)) // 2
console.log(Math.cbrt(27)) // 3
console.log(Math.cbrt(64)) // 4

Math.log2()

Math.log2(num) : returns the base 2 logarithm of a number,

/*  get  the base 2 logarithm of a number */
console.log(Math.log2(2)) // 1
console.log(Math.log2(8)) // 3
console.log(Math.log2(16)) // 4

Math.min()

Math.min(n1, n2, n3, ..) : returns The smallest number of the given numbers. If one of the giving arguments is not a number It returns NaN, and Infinity if no arguments are passed.

/*  get  the smallest of the given numbers. */
console.log(Math.min(2, 4, 6, 8)) // 2
console.log(Math.min(...[20, 10, 100, 70])) // 10
console.log(Math.min(7, "Aya", "Bouchiha", 3)) // NaN
console.log(Math.min()) // Infinity

Math.max()

Math.max(n1, n2, n3, ..) : returns The biggest number of the given numbers. If one of the giving arguments is not a number it returns NaN, and -Infinity if no arguments are passed.

/*  get  the biggest num of the given numbers. */
console.log(Math.max(2, 4, 6, 8)) // 8
console.log(Math.max(...[20, 10, 100, 70])) // 100
console.log(Math.max(7, "Aya", "Bouchiha", 3)) // NaN
console.log(Math.max()) // -Infinity

Math.abs()

Math.abs(num) : returns the absolute value of the giving number. This method can accept also numeric strings like '-1' .

It returns NaN if the giving argument is not a number or is not a numeric-string, or It is undefined or empty .
It returns 0 if the argument is null , [] , '' or ""

/*  get  the absolute value of the given number */
console.log(Math.abs(-2)) // 2 
console.log(Math.abs(0))  // 0
console.log(Math.abs(4.5)) // 4.5
console.log(Math.abs('')) // 0
console.log(Math.abs(null)) // 0
console.log(Math.abs([])) // 0
console.log(Math.abs('Aya Bouchiha')) // NaN
console.log(Math.abs([1, 2, 3, 4])) // NaN
console.log(Math.abs({})) // NaN 
console.log(Math.abs()) //  NaN
console.log(Math.abs(undefined)) // NaN

Math.tan()

Math.tan(angleInRadians) : returns the tangent of a giving angle(radians).

/*  get  the tangent an angle(radians) */
console.log(Math.tan(1)) // 1.5574077246549023
console.log(Math.tan(2)) // -2.185039863261519
console.log(Math.tan()) // NaN
console.log(Math.tan('')) // 0

Math.sin()

Math.sin(angleInRadians) : returns the sine of a giving angle
(radians), in addition, it is between -1 & 1.

/*  get  the sine of an angle(radians) */
console.log(Math.sin(2)) // 0.9092974268256817
console.log(Math.sin(1)) // 0.8414709848078965
console.log(Math.sin()) // NaN
console.log(Math.sin('')) // 0

Math.cos()

Math.cos(angleInRadians) : returns the cosine of a giving angle
(radians), in addition, it is between -1 & 1.

/*  get  the cosine of an angle(radians) */
console.log(Math.cos(2)) // -0.4161468365471424
console.log(Math.cos(1)) // 0.5403023058681398
console.log(Math.cos()) // NaN
console.log(Math.cos('')) // 1

Math.exp()

Math.exp(number) : returns e^x

Math.Pi

Math.Pi : is a static property of Math that returns the value of PI (approximately 3.14)

/* PI */
const Pi = Math.PI
const CalculateAreaOfACircle = radius => Math.round(Pi* (radius ** 2));
console.log(Pi) // 3.141592653589793
console.log(CalculateAreaOfACircle(4)) //  50

Math.E

Math.E : is a static property of Math that returns the value of Euler's number (approximately 2.718)

/* Euler's numbe */
const e = Math.E
console.log(e) // 2.718281828459045

Math.LN2

Math.E : is a static property of Math that returns the natural logarithm of 2 (approximately 0.693)

/* natural logarithm of 2 */
console.log(Math.LN2) // 0.6931471805599453

Final Code

Final Code on github

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Your Complete Guide To Math Object in Javascript

Aya Bouchiha