The JavaScript Math library
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The Math object contains lots of utilities math-related. This tutorial describes them all
The Math object contains lots of utilities math-related.
It contains constants and functions.
Constants
Item | Description |
---|---|
Math.E | The constant e, base of the natural logarithm (means ~2.71828) |
Math.LN10 | The constant that represents the base e (natural) logarithm of 10 |
Math.LN2 | The constant that represents the base e (natural) logarithm of 2 |
Math.LOG10E | The constant that represents the base 10 logarithm of e |
Math.LOG2E | The constant that represents the base 2 logarithm of e |
Math.PI | The π constant (~3.14159) |
Math.SQRT1_2 | The constant that represents the reciprocal of the square root of 2 |
Math.SQRT2 | The constant that represents the square root of 2 |
Functions
All those functions are static. Math cannot be instantiated.
Math.abs()
Returns the absolute value of a number
Math.abs(2.5) //2.5
Math.abs(-2.5) //2.5
Math.acos()
Returns the arccosine of the operand
The operand must be between -1 and 1
Math.acos(0.8) //0.6435011087932843
Math.asin()
Returns the arcsine of the operand
The operand must be between -1 and 1
Math.asin(0.8) //0.9272952180016123
Math.atan()
Returns the arctangent of the operand
Math.atan(30) //1.5374753309166493
Math.atan2()
Returns the arctangent of the quotient of its arguments.
Math.atan2(30, 20) //0.982793723247329
Math.ceil()
Rounds a number up
Math.ceil(2.5) //3
Math.ceil(2) //2
Math.ceil(2.1) //3
Math.ceil(2.99999) //3
Math.cos()
Return the cosine of an angle expressed in radiants
Math.cos(0) //1
Math.cos(Math.PI) //-1
Math.exp()
Return the value of Math.E multiplied per the exponent that’s passed as argument
Math.exp(1) //2.718281828459045
Math.exp(2) //7.38905609893065
Math.exp(5) //148.4131591025766
Math.floor()
Rounds a number down
Math.floor(2.5) //2
Math.floor(2) //2
Math.floor(2.1) //2
Math.floor(2.99999) //2
Math.log()
Return the base e (natural) logarithm of a number
Math.log(10) //2.302585092994046
Math.log(Math.E) //1
Math.max()
Return the highest number in the set of numbers passed
Math.max(1,2,3,4,5) //5
Math.max(1) //1
Math.min()
Return the smallest number in the set of numbers passed
Math.max(1,2,3,4,5) //1
Math.max(1) //1
Math.pow()
Return the first argument raised to the second argument
Math.pow(1, 2) //1
Math.pow(2, 1) //2
Math.pow(2, 2) //4
Math.pow(2, 4) //16
Math.random()
Returns a pseudorandom number between 0.0 and 1.0
Math.random() //0.9318168241227056
Math.random() //0.35268950194094395
Math.round()
Rounds a number to the nearest integer
Math.round(1.2) //1
Math.round(1.6) //2
Math.sin()
Calculates the sin of an angle expressed in radiants
Math.sin(0) //0
Math.sin(Math.PI) //1.2246467991473532e-16)
Math.sqrt()
Return the square root of the argument
Math.sqrt(4) //2
Math.sqrt(16) //4
Math.sqrt(5) //2.23606797749979
Math.tan()
Calculates the tangent of an angle expressed in radiants
Math.tan(0) //0
Math.tan(Math.PI) //-1.2246467991473532e-16
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