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Number.prototype.toPrecision() Method in Number Class of Javascript Syntax with Examples
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Usage 
The toPrecision() method is used to returns a string value depend on Number object to the specified precision.
Syntax 
numberObj.toPrecision([precision])
Example
var numObj = 78.123456;

document.write(numObj.toPrecision(3));
document.write(numObj.toPrecision(2));
document.write(numObj.toPrecision(4));
Output 
78.1
78

78.12
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