JavaScript Unary Operators

JavaScript unary operators perform operations on a single operand. These operators are used for actions like type conversion, negation, incrementing, and checking a variable’s type.

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Common Unary Operators in JavaScript

• + (Unary Plus)
• - (Unary Minus)
• ++ (Increment)
• -- (Decrement)
• typeof
• delete
• void

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Example 1: Unary Plus and Minus

• + converts the string or boolean to a number
• - negates the number

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Example 2: Increment and Decrement

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Example 3: typeof Operator

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Example 4: delete Operator

Removes a property from an object.

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Example 5: void Operator

Always returns undefined, no matter the expression.

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Key Takeaways

• Unary operators act on one operand.
• + and - are used for type coercion.
• ++ and -- increase or decrease values.
• typeof checks data type.
• delete removes a property from an object.
• void returns undefined — used in advanced scenarios like bookmarking or JS URIs.

Unary operators are useful for type conversion, logical control, and runtime debugging.