JavaScript Core Reference - Beginning JavaScript - page 687

Methods

Method Introduced Description

apply(thisObj,
arguments)

JavaScript 1.3 Calls a function or method as if it belonged to thisObj

and passes arguments to the function or method.
arguments must be an array.

call(thisObj,
arg1, …)

JavaScript 1.3 Identical to apply(), except arguments are passed indi-

vidually instead of in an array.

toString() JavaScript 1.1 Converts the Function object into a string.

valueOf() JavaScript 1.1 Returns the primitive value of the Function object.

Math
The Math object provides methods and properties used for mathematical calculations. Introduced in
JavaScript 1.0, the Math object is a top-level object, which can be accessed without a constructor.

Properties

Property Introduced Description

E JavaScript 1.0 Returns Euler's constant (the base of natural logarithms;

approximately 2.718).

LN10 JavaScript 1.0 Returns the natural logarithm of 10 (approximately 2.302).

LN2 JavaScript 1.0 Returns the natural logarithm of 2 (approximately 0.693).

LOG10E JavaScript 1.0 Returns the base 10 logarithm of E (approximately 0.434).

LOG2E

JavaScript 1.0 Returns the base 2 logarithm of E (approximately 1.442).

PI JavaScript 1.0 Returns pi, the ratio of the circumference of a circle to its diameter

(approximately 3.142).

SQRT1_2 JavaScript 1.0 Returns the square root of 1/2 (approximately 0.707).

SQRT2 JavaScript 1.0 Returns the square root of 2 (approximately 1.414).

Methods

Method Introduced Description

abs(x) JavaScript 1.0 Returns the absolute (positive) value of a number.

acos(x) JavaScript 1.0 Returns the arccosine of a number (in radians).

asin(x)

JavaScript 1.0 Returns the arcsine of a number (in radians).

Continued