JavaScript Math : Object

Contains math related constants and functions.

Math Properties

The constant e = 2.718...

Example:

console.log(Math.E);

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LN10 : Number

The value of the natural log of 10.

Example:

console.log(Math.LN10);
console.log(Math.log(10));

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LN2 : Number

The value of the natural log of 2.

Example:

console.log(Math.LN2);
console.log(Math.log(2));

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LOG10E : Number

The value of the log base 10 of e.

Example:

console.log(Math.LOG10E);
console.log(Math.log(Math.E) / Math.log(10));

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LOG2E : Number

The value of the log base 2 of e.

Example:

console.log(Math.LOG2E);
console.log(Math.log(Math.E) / Math.log(2));

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PI : Number

The constant pi = 3.14...

Example:

console.log(Math.PI);

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SQRT1_2 : Number

The value of 1 / sqrt(2).

Example:

console.log(Math.SQRT1_2);
console.log(1 / Math.sqrt(2));

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SQRT2 : Number

The value of sqrt(2).

Example:

console.log(Math.SQRT2);
console.log(Math.sqrt(2));

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Math Methods

abs(x : Number) : Number

Returns the absolute value of x.

Example:

console.log(Math.abs(10));
console.log(Math.abs(-10));

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acos(x : Number) : Number

Returns the angle (in radians between 0 and pi) whose cosine is x.

Example:

console.log(Math.acos(1));
console.log(Math.acos(0));
console.log(Math.acos(-1));

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asin(x : Number) : Number

Returns the angle (in radians between -pi/2 and pi/2) whose sine is x.

Example:

console.log(Math.asin(1));
console.log(Math.asin(0));
console.log(Math.asin(-1));

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atan(x : Number) : Number

Returns the angle (in radians between -pi/2 and pi/2) whose tangent is x.

Example:

console.log(Math.atan(1));
console.log(Math.atan(0));
console.log(Math.atan(-1));

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atan2(y : Number, x : Number) : Number

Returns the angle (in radians between -pi and pi) between the positive x axis and the line segment from the origin to the point at (x, y).

Example:

console.log(Math.atan2(1, 0));
console.log(Math.atan2(0, 1));
console.log(Math.atan2(-1, 0));
console.log(Math.atan2(0, -1));

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ceil(x : Number) : Number

Returns the next integer greater than or equal to x.

Example:

console.log(Math.ceil(1.9));
console.log(Math.ceil(2));
console.log(Math.ceil(-1.9));

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cos(x : Number) : Number

Returns the cosine of x (in radians).

Example:

console.log(Math.cos(0));
console.log(Math.cos(Math.PI / 2));
console.log(Math.cos(Math.PI));

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exp(x : Number) : Number

Returns e raised to the x power.

Example:

console.log(Math.exp(2));
console.log(Math.E * Math.E);

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floor(x : Number) : Number

Returns the previous integer less than or equal to x.

Example:

console.log(Math.floor(1.9));
console.log(Math.floor(2));
console.log(Math.floor(-1.9));

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log(x : Number) : Number

Returns the natural logarithm (base e) of x. To compute the logarithm with respect to a different base b, use the formula Math.log(x) / Math.log(b).

Example:

var x = Math.exp(2);
console.log(x);
console.log(Math.log(x));
var logb = function(x, b) {
  return Math.log(x) / Math.log(b);
}
console.log(logb(10000, 10));

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max(x1 : Number, x2 : Number, [...]) : Number

Returns the largest number among the parameters.

Example:

var x = 3, y = 1, z = 4;
console.log(Math.max(x, y, z));

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min(x1 : Number, x2 : Number, [...]) : Number

Returns the smallest number among the parameters.

Example:

var x = 3, y = 1, z = 4;
console.log(Math.min(x, y, z));

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pow(x : Number, y : Number) : Number

Returns x raised to the y power.

Example:

console.log(Math.pow(2, 3));

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random() : Number

Returns a random number between 0 (inclusive) and 1 (exclusive).

Example:

console.log(Math.random());
console.log(Math.random());
console.log(Math.random());

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round(x : Number) : Number

Returns the closest integer to x.

Example:

console.log(Math.round(2.2));
console.log(Math.round(2.5));
console.log(Math.round(-2.5));

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sin(x : Number) : Number

Returns the sine of x (in radians).

Example:

console.log(Math.sin(0));
console.log(Math.sin(Math.PI / 2));
console.log(Math.sin(Math.PI));

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sqrt(x : Number) : Number

Returns the square root of x.

Example:

console.log(Math.sqrt(16));

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tan(x : Number) : Number

Returns the tangent of x (in radians).

Example:

console.log(Math.tan(0));
console.log(Math.tan(Math.PI / 4));
console.log(Math.tan(Math.PI));

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