The unary negation operator (
-) precedes its operand and negates it.
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const x = 3; const y = -x; // y = -3 // x = 3
The unary negation operator can convert a non-number into a number.
const x = "4"; const y = -x; // y = -4
The definition of 'Unary negation operator' in that specification.
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