Web Reference: Mar 13, 2024 · Undefined is a type of Data type in JavaScript. It is a primitive value undefined, when a variable is declared and not initialized or not assigned with any value. In the first example, JavaScript treats 16 and 4 as numbers, until it reaches "Volvo". In the second example, since the first operand is a string, all operands are treated as strings. Jul 8, 2025 · Programming languages all have built-in data structures, but these often differ from one language to another. This article attempts to list the built-in data structures available in JavaScript and what properties they have. These can be used to build other data structures.
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Javascript Data Types Explained Undefined Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $78M - $120M
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Last Updated: April 7, 2026
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