Web Reference: Jan 22, 2026 · JavaScript passes primitive data types (Boolean, Null, Undefined, String, Number) by value, meaning changes do not affect the original data. Non-primitive data types (Object, Array, Function) are passed by value of their reference, so changes can impact the original memory location. In JavaScript, the type of the value solely controls whether that value will be assigned by value-copy or by reference-copy. Primitive values are always assigned/passed by value-copy: You can add, change, or delete properties to a reference value, whereas you cannot do it with a primitive value. Copying a primitive value from one variable to another creates a separate value copy, meaning that changing the value in one variable does not affect the other.
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Javascript Primitives Copy By Value Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $75M - $94M
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Last Updated: April 8, 2026
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