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    toExponential Redirect 1

    Summary

    The toExponential() method returns a string representing the Number object in exponential notation

    Syntax

    numObj.toExponential(fractionDigits)

    Parameter

    fractionDigits
    An integer specifying the number of digits after the decimal point. Defaults to as many digits as necessary to specify the number.

    Returns

    A string representing a Number object in exponential notation with one digit before the decimal point, rounded to fractionDigits digits after the decimal point. 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 a space 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 that 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().

    Throws

    RangeError
    If fractionDigits 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.

    Examples

    var numObj = 77.1234;
    
    alert("numObj.toExponential() is " + numObj.toExponential()); //displays 7.71234e+1
    
    alert("numObj.toExponential(4) is " + numObj.toExponential(4)); //displays 7.7123e+1
    
    alert("numObj.toExponential(2) is " + numObj.toExponential(2)); //displays 7.71e+1
    
    alert("77.1234.toExponential() is " + 77.1234.toExponential()); //displays 7.71234e+1
    
    alert("77 .toExponential() is " + 77 .toExponential()); //displays 7.7e+1

    Specifications

    Specification Status Comment
    ECMAScript 3rd Edition. Implemented in JavaScript 1.5 Standard Initial definition.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Number.prototype.toExponential' in that specification.
    Standard  
    ECMAScript 6 (ECMA-262)
    The definition of 'Number.prototype.toExponential' in that specification.
    Draft  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See Also

    Document Tags and Contributors

    Contributors to this page: Sheppy
    Last updated by: Sheppy,
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