Kyle Simpson's You Don't Know JS: Types & Grammar PDF

By Kyle Simpson

ISBN-10: 1491904194

ISBN-13: 9781491904190

No topic how a lot event you've gotten with JavaScript, odds are you don’t totally comprehend the language. As a part of the "You Don’t recognize JS" sequence, this compact advisor explores JavaScript forms in higher intensity than prior remedies by way of taking a look at variety coercion difficulties, demonstrating why forms paintings, and exhibiting you ways to exploit those features.

Like different books during this sequence, You Don’t understand JS: kinds & Grammar dives into trickier elements of the language that many JavaScript programmers easily steer clear of or suppose don’t exist (like types). Armed with this data, you could in achieving actual JavaScript mastery.

With this ebook you will:

  • Get familiar with JavaScript’s seven varieties: null, undefined, boolean, quantity, string, item, and symbol
  • Understand why JavaSript’s designated array, string, and quantity features may possibly pride or confound you
  • Learn how natives supply item wrappers round primitive values
  • Dive into the coercion controversy—and study why this selection comes in handy in lots of cases
  • Explore a number of nuances in JavaScript syntax, concerning statements, expressions, and different features

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Additional info for You Don't Know JS: Types & Grammar

Sample text

It’s important to note that neither c nor d more “owns” the [1,2,3] value—both are just equal peer references to the value. push(4)) the actual shared array value itself, it’s affecting just the one shared value, and both references will reference the newly modified value [1,2,3,4]. Since references point to the values themselves and not to the variables, you cannot use one reference to change where another reference is pointed: var a = [1,2,3]; var b = a; a; // [1,2,3] b; // [1,2,3] // later b = [4,5,6]; a; // [1,2,3] b; // [4,5,6] When we make the assignment b = [4,5,6], we are doing absolutely nothing to affect where a is still referencing ([1,2,3]).

IsNaN( b ); // true--ouch! Clearly, "foo" is literally not a number, but it’s definitely not the NaN value either! This bug has been in JS since the very beginning (over 19 years of ouch). ). isNaN( b ); // false--phew! ) polyfill even easier, by taking advantage of that peculiar fact that NaN isn’t equal to itself. NaN is the only value in the whole language where that’s true; every other value is always equal to itself. == n; }; } Weird, huh? But it works! NaNs are probably a reality in a lot of real-world JS programs, either on purpose or by accident.

DoSomethingCool(); })(); Here, FeatureXYZ is not at all a global variable, but we’re still using the safety guard of typeof to make it safe to check for. ___) to make the check, so typeof is quite helpful. Other developers would prefer a design pattern called “dependency injection,” where instead of doSomethingCool() inspecting implicitly for FeatureXYZ to be defined outside/around it, it would need to have the dependency explicitly passed in, like: function doSomethingCool(FeatureXYZ) { var helper = FeatureXYZ || function() { /*..

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You Don't Know JS: Types & Grammar by Kyle Simpson


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