test if a value is a valid number.
Last updated 2 years ago
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⟩ ⟩ ⟩ ⟩ functions ⟩ isNumber()
determine if a value is a (valid) number, equivalent to .
replit：
// ⭐️ 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 ---------------------------------------------
isPrimitive() / isObject()
NaN
⭐️