Unary Minus Operator

The unary minus operator is a prefixed (-) sign attached with a value.

let three = 3
let minusThree = -three       // minusThree equals -3
let plusThree = -minusThree   // plusThree equals 3, or "minus minus three"

The unary minus operator (-) is placed directly before the value, without any white space.

Unary Plus Operator

The unary plus operator (+) returns the returns the exactely same value it operates on, without any change.

let three = 3
let plusThree = +3 (same as 3)

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