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Javascript Number - toPrecision()

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This method returns a string representing the number object to the specified precision.


number.toPrecision( [ precision ] )

Here is the detail of parameters:

  • precision: An integer specifying the number of significant digits.

Return Value:

Returns a string representing a Number object in fixed-point or exponential notation rounded to precision significant digits.


<title>JavaScript toPrecision() Method </title>
<script type="text/javascript">
   var num = new Number(7.123456);
   document.write("num.toPrecision() is " + num.toPrecision());
   document.write("<br />"); 

   document.write("num.toPrecision(4) is " + num.toPrecision(4)); 
   document.write("<br />"); 

   document.write("num.toPrecision(2) is " + num.toPrecision(2)); 
   document.write("<br />"); 

   document.write("num.toPrecision(1) is " + num.toPrecision(1)); 

This will produce following result:

num.toPrecision() is 7.123456
num.toPrecision(4) is 7.123
num.toPrecision(2) is 7.1
num.toPrecision(1) is 7 

To understand it in better way you can Try it yourself.

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