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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

Number.toExponential( ) — format a number using exponential notation

Availability

JavaScript 1.5; JScript 5.5, ECMAScript v3

Synopsis

                  number.toExponential(digits)

Arguments

digits

The number of digits that will appear after the decimal point. This may be a value between 0 and 20, inclusive, and implementations may optionally support a larger range of values. If this argument is omitted, as many digits as necessary will be used.

Returns

A string representation of number, in exponential notation, with one digit before the decimal place and digits digits after the decimal place. The fractional part of the number is rounded, or padded with zeros, as necessary, so that it has the specified length.

Throws

RangeError

If digits is too small or too large. Values between 0 and 20, inclusive, will not cause a RangeError. Implementations are allowed to support larger and smaller values as well.

TypeError

If this method is invoked on an object that is not a Number.

Example

var n = 12345.6789;
n.toExponential(1);     // Returns 1.2e+4
n.toExponential(5);     // Returns 1.23457e+4
n.toExponential(10);    // Returns 1.2345678900e+4
n.toExponential(  );    // Returns 1.23456789e+4
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Publisher Resources

ISBN: 0596000480Supplemental ContentCatalog PageErrata