JS Boolean Coercion

Boolean coercion: In javascript coercion, all values are converted to true except for the following values which are coerced to false:

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console.log(!!"");         // false
console.log(!!0);          // false
console.log(!!null);       // false
console.log(!!undefined);  // false
console.log(!!NaN);        // false
console.log(!!false);      // false

References