Web Reference: Oct 28, 2025 · JavaScript is unique to have two nullish values: null and undefined. Semantically, their difference is very minor: undefined represents the absence of a value, while null represents the absence of an object. JavaScript is very flexible with regards to checking for "null" values. I'm guessing you're actually looking for empty strings, in which case this simpler code will work: Which will check for empty strings (""), null, undefined, false and the numbers 0 and NaN. Mar 31, 2024 · JavaScript has multiple ways of indicating the absence of a value. This page describes the two most common ways: the null and undefined data types. The null keyword represents an intentionally defined absence of value. null is a primitive, although the typeof operator returns that null is an object.
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