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Nullish coalescing operator (??) - JavaScript | MDN - MDN Web Docs js let foo; foo is never assigned any value so it is still undefined const someDummyText = foo || "Hello!"; However, due to || being a boolean logical operator, the left-hand-side operand was coerced to a boolean for the evaluation and any falsy value (including 0 , '' , NaN , false , etc ) was not returned
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Expressions and operators - JavaScript | MDN - MDN Web Docs js propNameOrNumber in objectName where propNameOrNumber is a string, numeric, or symbol expression representing a property name or array index, and objectName is the name of an object
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The Modern JavaScript Tutorial Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more
JavaScript Tutorial Section 7 Classes Class – introduce you to the ES6 class syntax and how to declare a class ; Getters and Setters – define the getters and setters for a class using the get and set keywords ; Class Expression – learn an alternative way to define a new class using a class expression ; Computed property – explain the computed property and its practical application
JavaScript - Wikipedia JavaScript ( ˈ dʒ ɑː v ə s k r ɪ p t ⓘ), often abbreviated as JS, is a programming language and core technology of the World Wide Web, alongside HTML and CSS Ninety-nine percent of websites use JavaScript on the client side for webpage behavior