JavaScript Language | 10 Minute‐Test 14

JavaScript’s prototype-based inheritance mechanism is dynamic: an object inherits properties from its prototype, even if the prototype changes after the object is created. This means that we can augment JavaScript classes simply by adding new methods to their prototype objects.

JavaScript code is as easy to be implemented and run. It can be called by using a function or a method.

Modules that have more than one item in their API can return a namespace object.

Using non greedy repetition may not always produce the results you expect. /a+?b/ matches the letter b preceded by the fewest number of a’s possible.

There is a larger class of subsets that have been designed for the purpose of safely running untrusted JavaScript in a secure container or “sandbox”.

In the above code snippet, p is not defined. Hence, it gives a ReferenceError.

The typeof operator returns “object” for all standard JavaScript objects as functions are, and the typeof operator returns “xml”.

The process object is an event emitter. The Node defines other important globals under the process namespaces that contain properties of that object like version, argv, env, pid,getuid(), cwd(), chdir() and exit().

Rhino is distributed as a JAR archieve. Start it with a command line like this :
java -jar rhino1_7R2/js.jar program.js If you omit program.js, Rhino starts an interactive shell, which is useful for trying out simple programs and one-liners.

Node defines console.log() for debugging output like browsers do.