Skip to Main Content
JavaScript: The Definitive Guide, Fourth Edition
book

JavaScript: The Definitive Guide, Fourth Edition

by David Flanagan
November 2001
Intermediate to advanced content levelIntermediate to advanced
936 pages
68h 43m
English
O'Reilly Media, Inc.
Content preview from JavaScript: The Definitive Guide, Fourth Edition

Name

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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

JavaScript: A Beginner's Guide, Fourth Edition, 4th Edition

JavaScript: A Beginner's Guide, Fourth Edition, 4th Edition

John Pollock
Coding with JavaScript For Dummies

Coding with JavaScript For Dummies

Chris Minnick, Eva Holland

Publisher Resources

ISBN: 0596000480Supplemental ContentCatalog PageErrata