By Cody Lindley
ISBN-10: 1449342884
ISBN-13: 9781449342883
If you are a sophisticated newbie or intermediate JavaScript developer, JavaScript Enlightenment will solidify your knowing of the language - specially when you use a JavaScript library. during this concise publication, JavaScript professional Cody Lindley (jQuery Cookbook) presents a correct view of the language by way of analyzing its items and assisting nuances. Libraries and frameworks assist you construct net functions quick and successfully, but if issues get it wrong or functionality turns into a subject, figuring out how and why they paintings is necessary. if you are able to cross below the hood and get your palms soiled with JavaScript internals, this is often your ebook.
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Extra resources for JavaScript Enlightenment: From Library User to JavaScript Developer
Example text
Dynamic Properties Allow for Mutable Objects Complex objects are made up of dynamic properties. This allows for user-defined objects—and most of the native objects—to be mutated. This means that the majority of objects in JavaScript can be updated or changed at any time. Because of this, we can change the native pre-configured nature of JavaScript itself by augmenting its native objects. However, I am not telling you to do this; in fact, I do not think you should. But let’s not cloud what is possible with opinions.
That is, a number is a number, a string is a string, a boolean is either true or false, and null and undefined are just that, null and undefined. These values are inherently simple, and do not represent values that can be made up of other values. a. info | 13 Examine the code below and ask yourself if the string, number, boolean, null, and undefined values could be more complex. Contrast this to what you know of an Object() instance or Array() instance or really any complex object. log(myString, myNumber, myBoolean, myNull, myUndefined); /* Consider that a complex object like array or object can be made up of multiple primitive values, and thus becomes a complex set of multiple values.
In the example above, we copied, or cloned, the myString value to the variable myStringCopy. When we updated the my String value, the myStringCopy value still had a copy of the old myString value. Re‐ member this and contrast the mechanics here with complex objects (discussed below). info Primitive Values Are Equal by Value Primitives can be compared to see if their values are literally the same. , 10 = = = 10). The same, of course, would apply if you compare the primitive string 'foo' to another primitive string with a value of 'foo'.
JavaScript Enlightenment: From Library User to JavaScript Developer by Cody Lindley
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