JavaScript Number toExponential() method

Definition and usage

toExponential() The method converts a number to exponential notation.

Instance

Example 1

let num = 5.56789;
let n = num.toExponential(3);

Try it yourself

Example 2

Convert a number to exponential notation:

let num = 5.56789;
let n = num.toExponential();

Try it yourself

Syntax

number.toExponential(digits)

Parameter

Parameter Description
digits

Optional. An integer between 0 and 20, specifying the number of decimal places in exponential notation.

If omitted, it is set to the number of digits required to represent the value.

Return value

Type Description
String Represent the number in exponential notation.

Technical details

Return value

Returns the string representation of a Number using exponential notation, where there is one digit before the decimal point and digits Number of digits. The decimal part of the number will be rounded and, if necessary, padded with 0 to reach the specified length.

Thrown

Exception Description
RangeError

When digits Exception thrown if the value is too small or too large. Values between 0 and 20 do not cause this exception.

Some implementations support a wider or narrower range of values.
TypeError Exception thrown if the object called this method is not a Number.

Browser support

Number.constructor Is an ECMAScript3 (ES3) feature.

All browsers support ES3 (JavaScript 1999):

Chrome IE Edge Firefox Safari Opera
Chrome IE Edge Firefox Safari Opera
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