By Kishori Sharan
CoffeeScript program improvement provide you with an in-depth examine the CoffeeScript language, all whereas construction a operating net program. alongside the best way, you'll see the entire nice gains CoffeeScript has to provide, and how one can use them to house actual difficulties like sprawling codebases, incomplete information, and asynchronous net requests.
Through the process this e-book you are going to research the CoffeeScript syntax and notice it verified with easy examples. As you cross, you'll placed your new abilities into perform by means of development an internet program, piece by way of piece. You'll begin with regular language positive factors comparable to loops, features, and string manipulation. Then, we’ll delve into complex positive aspects like periods and inheritance. examine complicated idioms to house universal occurrences like exterior internet requests, and hone your method for improvement projects like debugging and refactoring.
CoffeeScript software improvement will train you not just the right way to write CoffeeScript, but additionally the best way to construct good purposes that run easily and are a excitement to take care of.
Find out how to construct outstanding and complicated reactive internet functions simply with Vue. jsAbout This BookLearn tips to propagate DOM adjustments around the site with out writing large jQuery callbacks code. in attaining reactivity and simply compose perspectives with Vue. js and comprehend what it does backstage.
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If you want to test if a key exists, you need to use its contains() method. Listing 3-1. println("params contains year = " + containsYear); } } 26 CHAPTER 3 N PASSING PARAMETERS TO SCRIPTS msg = Hello year = 1969 year = null params contains year = false You will not use a Bindings by itself. Often, you will use it to pass parameters from Java code to a script engine. The ScriptEngine interface contains a createBindings() method that returns an instance of the Bindings interface. This method gives a script engine a chance to return an instance of the specialized implementation of the Bindings interface.
I++ -- Decrement --i Decrements the operand by 1. i-delete delete prop Deletes the specified property from an object. void void expr Discards the return value of the specified expression. typeof typeof expr Returns a String describing the type of the specified expression. + Unary Plus +op Converts the operand to the Number type. - Unary Negation -op Converts the operand to the Number type and then negates the converted value. ~ Bitwise NOT ~op Uses the operand as a 32-bit signed integer, flips its bits, and returns the result as a 32-bit signed integer.
Reserved words listed in Table 4-1 are already in use as keywords. You are familiar with most of these keywords in Java. In Nashorn, they have the same meaning; for example, for, do, and while are used to denote looping constructs, whereas break and continue are used to break out of loops and continue with the next iteration in the loop. I will explain the keywords specific to Nashorn in this chapter briefly. Tables 4-2 and 4-3 list keywords that are not in use yet, but they will be used in the future.