TypeScript - get decimal part of float number

In this short article, we would like to show how to get the decimal part from a floating-point number using the modulo operator in TypeScript.

Practical example:

const getDecimalPart = (value: number): number => {
  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(NaN));       //   NaN
console.log(getDecimalPart(-Infinity)); //   NaN
console.log(getDecimalPart(+Infinity)); //   NaN

Output:

0
0.14000000000000012
-0.14000000000000012
0.123
-0.123

NaN
NaN
NaN