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JavaScript - how to get decimal part of float number?

8 points
Created by:
JustMike
26120

Using JavaScript it is possible to get decimal part of any floating point number in following way.

1. Modulo operator example

// ONLINE-RUNNER:browser;

function getDecimalPart(value) {
	return value % 1.0;
}

// Usage example:

console.log( getDecimalPart(  5     ) ); //   0
console.log( getDecimalPart(  3.14  ) ); //  ~0.14
console.log( getDecimalPart( -3.14  ) ); // ~-0.14
console.log( getDecimalPart(  0.123 ) ); //   0.123
console.log( getDecimalPart( -0.123 ) ); // ~-0.123

console.log( getDecimalPart( '+3.14'    ) ); //  ~0.14
console.log( getDecimalPart( '-3.14'    ) ); // ~-0.14
console.log( getDecimalPart(   NaN      ) ); //   NaN
console.log( getDecimalPart(  'foo'     ) ); //   NaN
console.log( getDecimalPart(  -Infinity ) ); //   NaN
console.log( getDecimalPart(  +Infinity ) ); //   NaN

 

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