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The ! (logical NOT) operator is a unary operator that negates a boolean expression. It evaluates to true if its operand is false, and evaluates to false if its operand is true. 
!operand

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Type Constraints

Go enforces strict type safety for logical operations. The operand supplied to the ! operator must resolve to a typed or untyped bool. Unlike languages such as C or JavaScript, Go does not implement “truthy” or “falsy” coercion. You cannot apply the ! operator to integers, pointers, strings, or nil values. Attempting to negate a non-boolean type results in a compile-time type mismatch error. 
var isSet bool = true
var isNotSet bool = !isSet // Evaluates to false

// Untyped boolean constant evaluation
const inverted = !false    // Evaluates to true

// INVALID: Go does not coerce non-boolean types
// var count int = 1
// var noCount bool = !count // Compile error: invalid operation: !count (operator ! not defined on int)

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Operator Precedence

The ! operator possesses the highest precedence among logical operators. In Go, unary operators (including !, unary *, unary &, and unary -) have the highest overall precedence, sitting strictly above the five precedence levels defined for binary operators. Because of this highest precedence, ! binds immediately to the expression directly to its right before any binary logical (&&, ||) or relational (==, !=) operators are evaluated. 
var x, y bool = false, true

// The ! operator binds strictly to 'x'.
// Evaluation order: (!x) && y -> (true) && true -> true
result := !x && y 

// To negate the result of a binary expression, parentheses are required.
// Evaluation order: !(x && y) -> !(false) -> true
groupedResult := !(x && y)
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