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Download JavaScript: The Good Parts by Douglas Crockford PDF

By Douglas Crockford

Such a lot programming languages include stable and undesirable elements, yet JavaScript has greater than its proportion of the undesirable, having been built and published in a rush ahead of it can be subtle. This authoritative ebook scrapes away those undesirable positive factors to bare a subset of JavaScript that's extra trustworthy, readable, and maintainable than the language as a whole-a subset you should use to create actually extensible and effective code.

Considered the JavaScript professional via many folks within the improvement neighborhood, writer Douglas Crockford identifies the abundance of excellent principles that make JavaScript a very good object-oriented programming language-ideas resembling services, unfastened typing, dynamic gadgets, and an expressive item literal notation. regrettably, those stable rules are jumbled in with undesirable and downright lousy principles, like a programming version in response to worldwide variables.

When Java applets failed, JavaScript grew to become the language of the net via default, making its acceptance nearly thoroughly self sustaining of its traits as a programming language. In JavaScript: the nice components , Crockford eventually digs during the steaming pile of excellent intentions and errors to offer you an in depth examine the entire really stylish elements of JavaScript, including:

-Syntax
-Objects
-Functions
-Inheritance
-Arrays
-Regular expressions
-Methods
-Style
-Beautiful features

The actual good looks? As you progress forward with the subset of JavaScript that this booklet offers, you'll additionally ward off the necessity to unlearn all of the undesirable components. after all, that allows you to discover extra in regards to the undesirable elements and the way to exploit them badly, easily seek advice the other JavaScript book.

With JavaScript: the great components , you'll find a attractive, based, light-weight and hugely expressive language that permits you to create powerful code, no matter if you're handling item libraries or simply attempting to get Ajax to run speedy. when you boost websites or functions for the internet, this booklet is an absolute needs to.

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Extra info for JavaScript: The Good Parts

Sample text

If you want it to add, make sure both operands are numbers. The / operator can produce a noninteger result even if both operands are integers. The && operator produces the value of its first operand if the first operand is falsy. Otherwise, it produces the value of the second operand. == logical or || logical and && The || operator produces the value of its first operand if the first operand is truthy. Otherwise, it produces the value of the second operand. invocation ( ) expression , Invocation causes the execution of a function value.

It gives the function access to all of the arguments that were supplied with the invocation, including excess arguments that were not assigned to parameters. This makes it possible to write functions that take an unspecified number of parameters: // Make a function that adds a lot of stuff. // // // // Note that defining the variable sum inside of the function does not interfere with the sum defined outside of the function. The function only sees the inner one. writeln(sum(4, 8, 15, 16, 23, 42)); // 108 This is not a particularly useful pattern.

Seqer is simply a collection of functions, and those functions are capabilities that grant specific powers to use or modify the secret state. gensym to a third party’s function, that function would be able to generate unique strings, but would be unable to change the prefix or seq. Cascade Some methods do not have a return value. For example, it is typical for methods that set or change the state of an object to return nothing. If we have those methods return this instead of undefined, we can enable cascades.

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