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String.prototype.trimRight - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/TrimRight 

Function.prototype.toSource

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toSource

Extension properties, functions in global object

__FILE__ , __LINE__, __DIR__

Current executing script file, line, directory of the script can be accessed by these global (read-only) properties. This is useful in debug/tracing scripts.

Code Block
title__FILE__ and __LINE__
print(__FILE__, __LINE__, __DIR__)

print function

print function prints it's arguments (after converting those to Strings) on standard output

Code Block
titleprint
print("hello", "world")

load function

Loads and evaluates script from a file or a URL or a script object. Examples:

Code Block
titleload function
// can load script from files, URLs

load("foo.js"); // loads script from file "foo.js" from current directory
load("http://www.example.com/t.js"); // loads script file from given URL

// loads script from an object's properties. 

// Object should have "script" and "name" properties.
//     "script" property contains string code of the script. 
//     "name" property specifies name to be used while reporting errors from script
// This is almost like the standard "eval" except that it associates a name with
// the script string for debugging purpose.

load({ script: "print('hello')", name: "myscript.js"})

// load can also load from pseudo URLs like "nashorn:", "fx:". "nashorn:" pseudo URL scheme
// for nashorn's built-in scripts. "fx:" pseudo URL scheme for JavaFX support scripts

// load nashorn's parser support script - defines 'parse'
// function in global scope

load("nashorn:parser.js"); 

// load Mozilla compatibility script - which defines global functions
// like importPackage, importClass for rhino compatibility.

load("nashorn:mozilla_compat.js");