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Javascript tutorial
  • Debugging in the browser

    Debugging in the browser

    Debugging is the process of finding and fixing errors within a script. All modern browsers and most other environments support debugging tools – a special UI in developer tools that makes debugging much easier. It also allows to trace the code step by ste
    2025-01-07
  • Coding Style

    Coding Style

    Our code must be as clean and easy to read as possible.That is actually the art of programming – to take a complex task and code it in a way that is both correct and human-readable. A good code style greatly assists in that.
    2025-01-06
  • Comments

    Comments

    As we know from the chapter Code structure, comments can be single-line: startin
    2025-01-06
  • Ninja code

    Ninja code

    Learning without thought is labor lost; thought without learning is perilous.Con
    2025-01-03
  • Automated testing with Mocha

    Automated testing with Mocha

    Automated testing will be used in further tasks, and it’s also widely used in real projects.
    2025-01-03
  • Polyfills and transpilers

    Polyfills and transpilers

    The JavaScript language steadily evolves. New proposals to the language appear r
    2025-01-02
  • Objects

    Objects

    ​As we know from the chapter Data types, there are eight data types in JavaScript. Seven of them are called “primitive”, because their values contain only a single thing (be it a string or a number or whatever).
    2025-01-02
  • Object references and copying

    Object references and copying

    One of the fundamental differences of objects versus primitives is that objects are stored and copied “by reference”, whereas primitive values: strings, numbers, booleans, etc – are always copied “as a whole value”.
    2024-12-31
  • Garbage collection

    Garbage collection

    Memory management in JavaScript is performed automatically and invisibly to us.
    2024-12-31
  • Object methods, "this"

    Object methods, "this"

    Objects are usually created to represent entities of the real world, like users, orders and so on:
    2024-12-30
  • Constructor, operator "new"

    Constructor, operator "new"

    The regular {...} syntax allows us to create one object. But often we need to create many similar objects, like multiple users or menu items and so on.
    2024-12-30
  • Optional chaining '?.'

    Optional chaining '?.'

    If you’ve just started to read the tutorial and learn JavaScript, maybe the problem hasn’t touched you yet, but it’s quite common.
    2024-12-30
  • Symbol type

    Symbol type

    Otherwise, if one uses another type, such as number, it’s autoconverted to string. So that obj[1] is the same as obj["1"], and obj[true] is the same as obj["true"].
    2024-12-27
  • Object to primitive conversion

    Object to primitive conversion

    What happens when objects are added obj1 + obj2, subtracted obj1 - obj2 or print
    2024-12-27
  • Methods of primitives

    Methods of primitives

    JavaScript allows us to work with primitives (strings, numbers, etc.) as if they were objects. They also provide methods to call as such.
    2024-12-27
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