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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