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TypeScript - number has decimal part
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In this short article, we would like to show how to check if a number has a decimal part using TypeScript.
Practical example:
xxxxxxxxxx1
const hasDecimalPart = (value: number | string): boolean => {2
if (typeof value === 'string') {3
value = parseFloat(value);4
}5
return isFinite(value) && value % 1.0 !== 0;6
};7
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// Usage example:10
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console.log(hasDecimalPart( 5 )); // false12
console.log(hasDecimalPart( 3.14 )); // true13
console.log(hasDecimalPart( -3.14 )); // true14
console.log(hasDecimalPart( 0.123 )); // true15
console.log(hasDecimalPart( -0.123 )); // true16
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console.log(hasDecimalPart( '+3.14' )); // true18
console.log(hasDecimalPart( '-3.14' )); // true19
console.log(hasDecimalPart( NaN )); // false20
console.log(hasDecimalPart( 'foo' )); // false21
console.log(hasDecimalPart( -Infinity )); // false22
console.log(hasDecimalPart( +Infinity )); // false