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Logical operators

Logical operators are typically used with Boolean (logical) values. When they are, they return a Boolean value. However, the && and || operators actually return the value of one of the specified operands, so if these operators are used with non-Boolean values, they will return a non-Boolean value.

Sursa: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators

JavaScript.com

JavaScript.com is a resource for the JavaScript community. You will find resources and examples for JavaScript beginners as well as support for JavaScript experts …

Sursa: https://www.javascript.com/

Operators

There are many operators in JavaScript. Every operator has a corresponding precedence number. The one with the larger number executes first. If the precedence is …

Sursa: https://javascript.info/operators

Logical operators

In JavaScript, the operator is a little bit trickier and more powerful. But first, let’s see what happens with boolean values. There are four possible logical combinations:

Sursa: https://javascript.info/logical-operators

Javascript operator !==

Yes, it’s the same operator like ===, just for inequality:!== – returns true if the two operands are not identical. This operator will not convert the operands types, and only returns false if they are the same type and value.Wikibooks

Sursa: https://stackoverflow.com/questions/1889260/javascript-operator