The toExponential()
method returns a string representing the Number
object in exponential notation.
The toExponential()
method returns a string representing the Number
object in exponential notation.
toExponential() toExponential(fractionDigits)
fractionDigits
Optional
Optional. An integer specifying the number of digits after the decimal point. Defaults to as many digits as necessary to specify the number.
A string representing the given Number
object in exponential notation with one digit before the decimal point, rounded to fractionDigits
digits after the decimal point.
RangeError
If fractionDigits
is too small or too large. Values between 0
and 100
, inclusive, will not cause a RangeError
.
TypeError
If this method is invoked on an object that is not a Number
.
If the fractionDigits
argument is omitted, the number of digits after the decimal point defaults to the number of digits necessary to represent the value uniquely.
If you use the toExponential()
method for a numeric literal and the numeric literal has no exponent and no decimal point, leave whitespace(s) before the dot that precedes the method call to prevent the dot from being interpreted as a decimal point.
If a number has more digits than requested by the fractionDigits
parameter, the number is rounded to the nearest number represented by fractionDigits
digits. See the discussion of rounding in the description of the toFixed()
method, which also applies to toExponential()
.
const numObj = 77.1234; console.log(numObj.toExponential()); // logs 7.71234e+1 console.log(numObj.toExponential(4)); // logs 7.7123e+1 console.log(numObj.toExponential(2)); // logs 7.71e+1 console.log(77.1234.toExponential()); // logs 7.71234e+1 console.log(77 .toExponential()); // logs 7.7e+1
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Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
toExponential |
1 |
12 |
1 |
5.5 |
7 |
2 |
4.4 |
18 |
4 |
10.1 |
1 |
1.0 |
1.0 |
0.10.0 |
Number.prototype.toExponential
with many bug fixes is available in core-js
Number.prototype.toFixed()
Number.prototype.toPrecision()
Number.prototype.toString()
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toExponential