You Don't Know JS: Scope & Closures by Kyle Simpson

By Kyle Simpson

Irrespective of how a lot adventure you've gotten with JavaScript, odds are you don’t totally comprehend the language. This concise but in-depth advisor takes you inside of scope and closures, center thoughts you must comprehend to develop into a extra effective and powerful JavaScript programmer. You’ll find out how and why they paintings, and the way an knowing of closures could be a strong a part of your improvement skillset.

Like different books within the "You Don’t understand JS" sequence, Scope and Closures dives into trickier components of the language that many JavaScript programmers easily steer clear of. Armed with this data, you could in achieving actual JavaScript mastery.

-Learn approximately scope, a suite of principles to assist JavaScript engines find variables on your code
-Go deeper into nested scope, a chain of boxes for variables and functions
-Explore functionality- and block-based scope, “hoisting”, and the styles and advantages of scope-based hiding
-Discover easy methods to use closures for synchronous and asynchronous initiatives, together with the production of JavaScript libraries

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Additional resources for You Don't Know JS: Scope & Closures

Example text

Listing 3-4 demonstrates the use of jQuery selector to select an HTML element by its tag name. Listing 3-4. png"/>

How It Works In this code, various photos are displayed using the tag. , all HTML elements with tag name as IMG), you use the "htmlElementTagName" selector. , all HTML elements are created and loaded in the browser memory), the following code is executed as a result of the document-ready event handler.

Css("color", "blue") changes the CSS color property of HTML element

    to blue. –– css("text-decoration", "underline") changes the CSS text-decoration property of the HTML element

      to underline. –– append("

    • Implementation
    • ") appends a new child (item) to the HTML element

        . –– css("color", "green") changes the CSS color property of the HTML element

          to green. All of this is done in one single statement. In the code example, I set the CSS color property twice to demonstrate that when chaining, method execution is performed from left to right.

          The initial attribute and property values Notice that the attribute and property value of value is the same. Now change Name: to something else (for example, to John Smith) and click the button again. Figure 2-12 shows the pop-up message when the value of the Name: field is changed and the Display Attributes and Properties button is clicked. Figure 2-12. Attribute and property value after a value is entered in the Name: field The value of the value property has changed to John Smith, but the attribute value remains unaffected.

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