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A ! negates an expression.

In your example, if loadDynamicBlock() returned true, the function calling it would return false, and vice-versa: !true == false

A ! negates an expression.

In your example, if loadDynamicBlock() returned true, the function calling it would return false, and vice-versa: !true == false

It can also be used to create actual booleans from JavaScript's ideas of truthy and falsy.

var a = 5; !!(a - 5) === false; !!(a + 5) === true; 

A ! negates an expression. If loadDynamicBlock() returns true, this function (the one with the return statement) will return false, and vice-versa.

A ! negates an expression.

In your example, if loadDynamicBlock() returned true, the function calling it would return false, and vice-versa: !true == false

Negates the expression, so if loadDynamicBlock() returns true, this function (the one with the return statement) will return false, and vice-versa.

A ! negates an expression. If loadDynamicBlock() returns true, this function (the one with the return statement) will return false, and vice-versa.