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  1. SyntaxError: missing variable name - JavaScript...

    The JavaScript exception "missing variable name" is a common error. It is usually caused by omitting a variable name or a typographic error....Examples Missing a variable name js const = "foo"; It is easy to...assign a name for your variable! js const description = "foo"; Reserved...

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  2. JavaScript object basics - Learn web developmen...

    Congratulations, you've reached the end of our first Js objects article — you should now have a good idea of how to work with objects in JavaScript — including creating your own simple objects. You should also appreciate that objects are very useful as structures for storing related data and functionality — if you tried to keep track of all the properties and methods in our person object as separate variables and functions, it would be inefficient and frustrating, and we'd run the risk of clashing with other variables and functions that have the same names. Objects let us keep the information safely locked away in their own package, out of harm's way.... then saving and refreshing: js const person = {}; Now open your...in our file to look like this: js const person = { name: ["Bob"...

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  3. Method definitions - JavaScript | MDN

    Method definition is a shorter syntax for defining a function property in an object initializer. It can also be used in classes.... Try it Syntax js ({ property(parameters) {}, ...syntax. Given the following code: js const obj = { foo: function ()...

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  4. JavaScript language overview - JavaScript | MDN

    JavaScript is a multi-paradigm, dynamic language with types and operators, standard built-in objects, and methods. Its syntax is based on the Java and C languages — many structures from those languages apply to JavaScript as well. JavaScript supports object-oriented programming with object prototypes and classes. It also supports functional programming since functions are first-class objects that can be easily created via expressions and passed around like any other object.... js console.log(3 / 2); // 1.5, not...arithmetic can be imprecise. js console.log(0.1 + 0.2); // 0...

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  5. Using classes - JavaScript | MDN

    JavaScript is a prototype-based language — an object's behaviors are specified by its own properties and its prototype's properties. However, with the addition of classes, the creation of hierarchies of objects and the inheritance of properties and their values are much more in line with other object-oriented languages such as Java. In this section, we will demonstrate how objects can be created from classes....this may seem familiar to you : js const bigDay = new Date(2019...created with class declarations . js class MyClass { // class body...

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  6. TypeError: 'x' is not iterable - JavaScript | MDN

    The JavaScript exception "is not iterable" occurs when the value which is spread into an array or function call, given as the right-hand side of for...of, as argument of a function such as Promise.all or Set(), or as the right-hand side of an array destructuring assignment, is not an iterable object. This error is also encountered when Array.fromAsync() or for await...of is used with a non-async iterable.... js const nonIterable1 = {}; const...destructuring a non-iterable js const myObj = { arrayOrObjProp1:...

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  7. TypeError: can't access/set private field or me...

    The JavaScript exception "can't access private field or method: object is not the right class" or "can't set private field: object is not the right class" occurs when a private field or method is get or set on an object that does not have this private property defined.... js class MyClass { static #x = 0;...property with the same name. js class MyClass { #x = 0; doSomething()...

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  8. Grammar and types - JavaScript | MDN

    This chapter discusses JavaScript's basic grammar, variable declarations, data types and literals.... js const Früh = "foobar"; But, the...and in many other languages: js // a one line comment /* this...

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  9. SyntaxError: unlabeled break must be inside loo...

    The JavaScript exception "unlabeled break must be inside loop or switch" occurs when a break statement is not inside a loop or a switch statement.... js let score = 0; function increment()...to early-terminate a function. js let score = 0; function increment()...

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  10. Handling text — strings in JavaScript - Learn w...

    Next, we'll turn our attention to strings — this is what pieces of text are called in programming. In this article, we'll look at all the common things that you really ought to know about strings when learning JavaScript, such as creating strings, escaping quotes in strings, and joining strings together....with, enter the following lines: js const string = "The revolution...entering the following lines: js const badString1 = This is a...

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