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Number.prototype.toExponential() Method in Number Class of Javascript Syntax with Examples
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Usage  
The toExponential() method is used to return a string representing the Number object in exponential notation
Syntax  
numberObject.toExponential([fractionDigits])
Example
var numObj = 99.1234;
document.write(numObj.toExponential(4));
document.write(numObj.toExponential(2));
document.write(77 .toExponential())
Output 
9.9123e+1
9.91e+1
7.7e+1
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