AngularJS allows me to loop through an array with the ng-repeat directive very easily. (The ‘Resources’ tab will show you the JavaScript and css files I’ve included and the ‘Result’ tab will show you the output.) Notice the ng-init initializes the array with a list of languages. ng-repeat=”language in languages” will loop through the languages
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I’ve heard a lot about AngularJS and decided to learn it along with my brushing up on the JavaScript basics. Angular’s website says that it is “what HTML would have been, had it been designed for applications.” It supposedly helps build one-page web applications or single page applications (SPA’s) much better than most other JavaScript
Global execution scope for JavasScript in a web browser should be the window object. Global variables and functions are properties and methods of the window object. These functions and variables are destroyed when the browser is shutdown or the web page closed. When a function is called, a scope chain of variables is created which
JavaScript has no rules for the type of data that a variable must hold. The type and value can change. JavaScript divides the variables into two major types: Primitive and Reference. Primitive variables are simple atomic pieces of data and Reference variables are objects of multiple values. The five primitive types are: Undefined, Null, Boolean,
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Functions can’t be named eval or arguments JavaScript doesn’t care how many arguments are passed in nor about the data types of those arguments. Each function has an arguments object that holds the arguments passed in. You can access the arguments passed with arguments[0], arguments[1], etc. Use arguments.length to find out how many arguments were
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JavaScript uses the basic statements found in most languages. if/then/else do while while for-in Used to iterate the properties of an object. break Used in a loop to exit the loop immediately and continue at the statement following the loop. continue Used in a loop to exit the loop but executes from the beginning of
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Boolean values are converted to numbers before comparisons are made with the equal operator (==) and not equal operator (!=). Comparisons where one operand is a string and the other is a number converts the string to a number first. If one of the operands is an object and not the other then the object
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Values used in JavaScript multiplication are converted to numbers with the Number() casting function before they are used in the operation. Empty strings will become 0 and Boolean true will become 1. Addition on strings concatenates the two strings. If one of the operators is a string and the other is not, the non-string is
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JavaScript uses the increment (++) and decrement (–) on all data types. Putting the operator before the variable will change the value before the final evaluation of the statement. Putting the operator after the variable will change the value after the evaluation. Using the increment/decrement operator on a string first converts the value to a
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\n inside the string is used for ‘new line’ and \t is used for ‘tab’. Once a string has been defined in JavaScript it’s value can not change. To get around this, when you use operators to change the string, a new string is created and the old string is destroyed, all behind the scenes.
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