Math.floor( ) |
round a number down |
Availability
JavaScript 1.0; JScript 1.0; ECMAScript v1
Synopsis
Math.floor(x)
Arguments
- x
-
Any numeric value or expression.
Returns
The closest integer less than or equal to x.
Description
Math.floor( )
computes the floor function -- in
other words, it returns the nearest integer value that is less than
or equal to the function argument.
Math.floor( ) rounds a floating-point value down
to the closest integer. This behavior differs from that of
Math.round( ), which rounds up or down to the
nearest integer. Also note that Math.floor( )
rounds negative numbers down (i.e., to be more negative), not up
(i.e., closer to zero).
Example
a = Math.floor(1.99); // Result is 1.0
b = Math.floor(1.01); // Result is 1.0
c = Math.floor(1.0); // Result is 1.0
d = Math.floor(-1.01); // Result is -2.0
|