💾isNumber()
test if a value is a valid number.
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test if a value is a valid number.
Last updated
Was this helpful?
Was this helpful?
JS ⟩ value ⟩ primitive ⟩ number ⟩ functions ⟩ isNumber()
determine if a value is a (valid) number, equivalent to Number.isFinite(x).
replit： isNumber()
// ⭐️ is (valid) number?
function isNumber(value) {
return Number.isFinite(value);
}
// export
module.exports = { isNumber };💈範例：
value isNumber()? Number.isFinite()?
---------------------------------------------
123 ✅ ✅
-2.5 ✅ ✅
Infinity ❌ ❌
NaN ❌ ❌
'123' ❌ ❌
'' ❌ ❌ empty string