"! before variable javascript" Code Answer's
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! before variable javascript
// ! before a boolean variable will reverse the value:
var test = true;
console.log(test); // True
console.log(!test); // False
// In JavaScript, every value has an inherent boolean value.
// If you use ! on a string, for instance, it will convert the value
// to a bool. This is useful to see if the string exists:
var stringTest1 = "hello!";
var stringTest2 = "";
console.log(stringTest1); // hello!
console.log(!stringTest1); // False
console.log(stringTest2); //
console.log(!stringTest2); // True
Source: www.sean-lloyd.com
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